21625313628 has 48 divisors (see below), whose sum is σ = 51229946880. Its totient is φ = 7098960000.

The previous prime is 21625313623. The next prime is 21625313701. The reversal of 21625313628 is 82631352612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21625313623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 227733 + ... + 308403.

It is an arithmetic number, because the mean of its divisors is an integer number (1067290560).

Almost surely, 2^21625313628 is an apocalyptic number.

It is an amenable number.

21625313628 is an abundant number, since it is smaller than the sum of its proper divisors (29604633252).

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

21625313628 is a wasteful number, since it uses less digits than its factorization.

21625313628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81018 (or 81016 counting only the distinct ones).

The product of its digits is 103680, while the sum is 39.

The spelling of 21625313628 in words is "twenty-one billion, six hundred twenty-five million, three hundred thirteen thousand, six hundred twenty-eight".