21230522976 has 48 divisors (see below), whose sum is σ = 60017058864. Its totient is φ = 6532468224.

The previous prime is 21230522909. The next prime is 21230523053. The reversal of 21230522976 is 67922503212.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

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, 8504571 + ... + 8507066.

It is an arithmetic number, because the mean of its divisors is an integer number (1250355393).

Almost surely, 2^21230522976 is an apocalyptic number.

21230522976 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21230522976 is an abundant number, since it is smaller than the sum of its proper divisors (38786535888).

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

21230522976 is a wasteful number, since it uses less digits than its factorization.

21230522976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17011663 (or 17011655 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 39.

The spelling of 21230522976 in words is "twenty-one billion, two hundred thirty million, five hundred twenty-two thousand, nine hundred seventy-six".