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1121111220 = 223518685187
BaseRepresentation
bin100001011010010…
…1100110010110100
32220010120100110210
41002310230302310
54244001024340
6303125145420
736532200555
oct10264546264
92803510423
101121111220
115259244a9
1227355b270
1314b362b28
14a8c7632c
1568656180
hex42d2ccb4

1121111220 has 24 divisors (see below), whose sum is σ = 3139111584. Its totient is φ = 298962976.

The previous prime is 1121111209. The next prime is 1121111227. The reversal of 1121111220 is 221111211.

1121111220 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1121111196 and 1121111205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121111227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9342534 + ... + 9342653.

It is an arithmetic number, because the mean of its divisors is an integer number (130796316).

Almost surely, 21121111220 is an apocalyptic number.

1121111220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1121111220 is an abundant number, since it is smaller than the sum of its proper divisors (2018000364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1121111220 is a wasteful number, since it uses less digits than its factorization.

1121111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18685199 (or 18685197 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 1121111220 is about 33482.9989696264. The cubic root of 1121111220 is about 1038.8421594232.

Adding to 1121111220 its reverse (221111211), we get a palindrome (1342222431).

Subtracting from 1121111220 its reverse (221111211), we obtain a palindrome (900000009).

The spelling of 1121111220 in words is "one billion, one hundred twenty-one million, one hundred eleven thousand, two hundred twenty".

Divisors: 1 2 3 4 5 6 10 12 15 20 30 60 18685187 37370374 56055561 74740748 93425935 112111122 186851870 224222244 280277805 373703740 560555610 1121111220