21985740792 has 32 divisors (see below), whose sum is σ = 61071502800. Its totient is φ = 7328580192.

The previous prime is 21985740787. The next prime is 21985740817. The reversal of 21985740792 is 29704758912.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50892703 + ... + 50893134.

Almost surely, 2^21985740792 is an apocalyptic number.

It is an amenable number.

21985740792 is an abundant number, since it is smaller than the sum of its proper divisors (39085762008).

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

21985740792 is a wasteful number, since it uses less digits than its factorization.

21985740792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101785852 (or 101785842 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 54.

The spelling of 21985740792 in words is "twenty-one billion, nine hundred eighty-five million, seven hundred forty thousand, seven hundred ninety-two".