21005627622 has 24 divisors (see below), whose sum is σ = 48870236376. Its totient is φ = 6001607808.

The previous prime is 21005627537. The next prime is 21005627647. The reversal of 21005627622 is 22672650012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35723563 + ... + 35724150.

It is an arithmetic number, because the mean of its divisors is an integer number (2036259849).

Almost surely, 2^21005627622 is an apocalyptic number.

21005627622 is an abundant number, since it is smaller than the sum of its proper divisors (27864608754).

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

21005627622 is a wasteful number, since it uses less digits than its factorization.

21005627622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71447732 (or 71447725 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The spelling of 21005627622 in words is "twenty-one billion, five million, six hundred twenty-seven thousand, six hundred twenty-two".