21292985924 has 36 divisors (see below), whose sum is σ = 42677972736. Its totient is φ = 9105891504.

The previous prime is 21292985921. The next prime is 21292985927. The reversal of 21292985924 is 42958929212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21292985921) and next prime (21292985927).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21292985921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9646829 + ... + 9649035.

Almost surely, 2^21292985924 is an apocalyptic number.

It is an amenable number.

21292985924 is an abundant number, since it is smaller than the sum of its proper divisors (21384986812).

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

21292985924 is an equidigital number, since it uses as much as digits as its factorization.

21292985924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3392 (or 2803 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 53.

The spelling of 21292985924 in words is "twenty-one billion, two hundred ninety-two million, nine hundred eighty-five thousand, nine hundred twenty-four".