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1122121021 = 7222900429
BaseRepresentation
bin100001011100010…
…0011010100111101
32220012110122122211
41002320203110331
54244230333041
6303202540421
736543604600
oct10270432475
92805418584
101122121021
1152645414a
12273967711
1314b627648
14a905a337
15687a5481
hex42e2353d

1122121021 has 6 divisors (see below), whose sum is σ = 1305324510. Its totient is φ = 961817976.

The previous prime is 1122120997. The next prime is 1122121031. The reversal of 1122121021 is 1201212211.

It can be written as a sum of positive squares in only one way, i.e., 1024704121 + 97416900 = 32011^2 + 9870^2 .

It is a de Polignac number, because none of the positive numbers 2k-1122121021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1122120992 and 1122121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1122121031) 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, 11450166 + ... + 11450263.

It is an arithmetic number, because the mean of its divisors is an integer number (217554085).

Almost surely, 21122121021 is an apocalyptic number.

It is an amenable number.

1122121021 is a deficient number, since it is larger than the sum of its proper divisors (183203489).

1122121021 is an equidigital number, since it uses as much as digits as its factorization.

1122121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22900443 (or 22900436 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1122121021 is about 33498.0748849841. The cubic root of 1122121021 is about 1039.1539658504.

Adding to 1122121021 its reverse (1201212211), we get a palindrome (2323333232).

The spelling of 1122121021 in words is "one billion, one hundred twenty-two million, one hundred twenty-one thousand, twenty-one".

Divisors: 1 7 49 22900429 160303003 1122121021