21112427169 has 10 divisors (see below), whose sum is σ = 31538317250. Its totient is φ = 14074951392.

The previous prime is 21112427137. The next prime is 21112427261. The reversal of 21112427169 is 96172421112.

21112427169 is a `hidden beast` number, since 211 + 1 + 2 + 427 + 16 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19347419025 + 1765008144 = 139095^2 + 42012^2 .

It is not a de Polignac number, because 21112427169 - 2⁵ = 21112427137 is a prime.

It is a super-2 number, since 2×21112427169² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112427129) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 130323544 + ... + 130323705.

It is an arithmetic number, because the mean of its divisors is an integer number (3153831725).

Almost surely, 2^21112427169 is an apocalyptic number.

It is an amenable number.

21112427169 is a deficient number, since it is larger than the sum of its proper divisors (10425890081).

21112427169 is an equidigital number, since it uses as much as digits as its factorization.

21112427169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260647261 (or 260647252 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The spelling of 21112427169 in words is "twenty-one billion, one hundred twelve million, four hundred twenty-seven thousand, one hundred sixty-nine".