21902427297 has 20 divisors (see below), whose sum is σ = 32723270976. Its totient is φ = 14599462680.

The previous prime is 21902427271. The next prime is 21902427299. The reversal of 21902427297 is 79272420912.

It is a happy number.

21902427297 is a `hidden beast` number, since 219 + 0 + 2 + 427 + 2 + 9 + 7 = 666.

It is not a de Polignac number, because 21902427297 - 2¹² = 21902423201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21902427299) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 684772 + ... + 716042.

Almost surely, 2^21902427297 is an apocalyptic number.

21902427297 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21902427297 is a deficient number, since it is larger than the sum of its proper divisors (10820843679).

21902427297 is an equidigital number, since it uses as much as digits as its factorization.

21902427297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39930 (or 39921 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The spelling of 21902427297 in words is "twenty-one billion, nine hundred two million, four hundred twenty-seven thousand, two hundred ninety-seven".