21522501768 has 32 divisors (see below), whose sum is σ = 53826514560. Its totient is φ = 7171465920.

The previous prime is 21522501713. The next prime is 21522501799. The reversal of 21522501768 is 86710522512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103248 + ... + 231743.

It is an arithmetic number, because the mean of its divisors is an integer number (1682078580).

Almost surely, 2^21522501768 is an apocalyptic number.

It is an amenable number.

21522501768 is an abundant number, since it is smaller than the sum of its proper divisors (32304012792).

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

21522501768 is a wasteful number, since it uses less digits than its factorization.

21522501768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337677 (or 337673 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 39.

The spelling of 21522501768 in words is "twenty-one billion, five hundred twenty-two million, five hundred one thousand, seven hundred sixty-eight".