21663025227 has 12 divisors (see below), whose sum is σ = 31471911744. Its totient is φ = 14358535920.

The previous prime is 21663025213. The next prime is 21663025243. The reversal of 21663025227 is 72252036612.

21663025227 is a `hidden beast` number, since 2 + 16 + 630 + 2 + 5 + 2 + 2 + 7 = 666.

It is not a de Polignac number, because 21663025227 - 2¹² = 21663021131 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21663025191 and 21663025200.

It is not an unprimeable number, because it can be changed into a prime (21663025207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6955099 + ... + 6958212.

It is an arithmetic number, because the mean of its divisors is an integer number (2622659312).

Almost surely, 2^21663025227 is an apocalyptic number.

21663025227 is a deficient number, since it is larger than the sum of its proper divisors (9808886517).

21663025227 is a wasteful number, since it uses less digits than its factorization.

21663025227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13913490 (or 13913487 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The spelling of 21663025227 in words is "twenty-one billion, six hundred sixty-three million, twenty-five thousand, two hundred twenty-seven".