21941428524 has 12 divisors (see below), whose sum is σ = 51196666584. Its totient is φ = 7313809504.

The previous prime is 21941428511. The next prime is 21941428679. The reversal of 21941428524 is 42582414912.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 914226177 + ... + 914226200.

It is an arithmetic number, because the mean of its divisors is an integer number (4266388882).

Almost surely, 2^21941428524 is an apocalyptic number.

It is an amenable number.

21941428524 is an abundant number, since it is smaller than the sum of its proper divisors (29255238060).

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

21941428524 is a wasteful number, since it uses less digits than its factorization.

21941428524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1828452384 (or 1828452382 counting only the distinct ones).

The product of its digits is 184320, while the sum is 42.

The spelling of 21941428524 in words is "twenty-one billion, nine hundred forty-one million, four hundred twenty-eight thousand, five hundred twenty-four".