21107071524 has 48 divisors (see below), whose sum is σ = 61402392576. Its totient is φ = 5482356000.

The previous prime is 21107071483. The next prime is 21107071553. The reversal of 21107071524 is 42517070112.

It is a junction number, because it is equal to n+sod(n) for n = 21107071491 and 21107071500.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11420652 + ... + 11422499.

It is an arithmetic number, because the mean of its divisors is an integer number (1279216512).

Almost surely, 2^21107071524 is an apocalyptic number.

It is an amenable number.

21107071524 is an abundant number, since it is smaller than the sum of its proper divisors (40295321052).

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

21107071524 is a wasteful number, since it uses less digits than its factorization.

21107071524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22843176 (or 22843174 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 30.

The spelling of 21107071524 in words is "twenty-one billion, one hundred seven million, seventy-one thousand, five hundred twenty-four".