21966724390524 has 24 divisors (see below), whose sum is σ = 52346236846848. Its totient is φ = 7166449091760.

The previous prime is 21966724390511. The next prime is 21966724390603. The reversal of 21966724390524 is 42509342766912.

It is a happy number.

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, 19474045882 + ... + 19474047009.

It is an arithmetic number, because the mean of its divisors is an integer number (2181093201952).

Almost surely, 2^{21966724390524} is an apocalyptic number.

It is an amenable number.

21966724390524 is an abundant number, since it is smaller than the sum of its proper divisors (30379512456324).

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

21966724390524 is a wasteful number, since it uses less digits than its factorization.

21966724390524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38948092945 (or 38948092943 counting only the distinct ones).

The product of its (nonzero) digits is 39191040, while the sum is 60.

The spelling of 21966724390524 in words is "twenty-one trillion, nine hundred sixty-six billion, seven hundred twenty-four million, three hundred ninety thousand, five hundred twenty-four".