21625967790 has 64 divisors (see below), whose sum is σ = 65907717120. Its totient is φ = 4943077920.

The previous prime is 21625967747. The next prime is 21625967791. The reversal of 21625967790 is 9776952612.

21625967790 is a `hidden beast` number, since 2 + 1 + 625 + 9 + 6 + 7 + 7 + 9 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21625967791) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5719266 + ... + 5723045.

It is an arithmetic number, because the mean of its divisors is an integer number (1029808080).

Almost surely, 2^21625967790 is an apocalyptic number.

21625967790 is an abundant number, since it is smaller than the sum of its proper divisors (44281749330).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21625967790 is a wasteful number, since it uses less digits than its factorization.

21625967790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11442334 (or 11442328 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 54.

The spelling of 21625967790 in words is "twenty-one billion, six hundred twenty-five million, nine hundred sixty-seven thousand, seven hundred ninety".