21430912992 has 48 divisors (see below), whose sum is σ = 56265269760. Its totient is φ = 7142479232.

The previous prime is 21430912981. The next prime is 21430913039. The reversal of 21430912992 is 29921903412.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 742609 + ... + 770927.

It is an arithmetic number, because the mean of its divisors is an integer number (1172193120).

Almost surely, 2^21430912992 is an apocalyptic number.

It is an amenable number.

21430912992 is an abundant number, since it is smaller than the sum of its proper divisors (34834356768).

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

21430912992 is a wasteful number, since it uses less digits than its factorization.

21430912992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36215 (or 36207 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 42.

The spelling of 21430912992 in words is "twenty-one billion, four hundred thirty million, nine hundred twelve thousand, nine hundred ninety-two".