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11121021 = 321235669
BaseRepresentation
bin101010011011…
…000101111101
3202221000011200
4222123011331
510321333041
61034210113
7163345542
oct52330575
922830150
1011121021
11630642a
123883939
1323c4bb2
141696bc9
15e9a1b6
hexa9b17d

11121021 has 6 divisors (see below), whose sum is σ = 16063710. Its totient is φ = 7414008.

The previous prime is 11120981. The next prime is 11121037. The reversal of 11121021 is 12012111.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 7080921 + 4040100 = 2661^2 + 2010^2 .

It is not a de Polignac number, because 11121021 - 218 = 10858877 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 1235669 = 11121021 / (1 + 1 + 1 + 2 + 1 + 0 + 2 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 11120994 and 11121012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 617826 + ... + 617843.

It is an arithmetic number, because the mean of its divisors is an integer number (2677285).

Almost surely, 211121021 is an apocalyptic number.

It is an amenable number.

11121021 is a deficient number, since it is larger than the sum of its proper divisors (4942689).

11121021 is a wasteful number, since it uses less digits than its factorization.

11121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235675 (or 1235672 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 11121021 is about 3334.8194853695. The cubic root of 11121021 is about 223.2106370427.

Adding to 11121021 its reverse (12012111), we get a palindrome (23133132).

The spelling of 11121021 in words is "eleven million, one hundred twenty-one thousand, twenty-one".

Divisors: 1 3 9 1235669 3707007 11121021