21644094092 has 12 divisors (see below), whose sum is σ = 38900872080. Its totient is φ = 10529559216.

The previous prime is 21644094083. The next prime is 21644094103. The reversal of 21644094092 is 29049044612.

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, 73121792 + ... + 73122087.

It is an arithmetic number, because the mean of its divisors is an integer number (3241739340).

Almost surely, 2^21644094092 is an apocalyptic number.

It is an amenable number.

21644094092 is a deficient number, since it is larger than the sum of its proper divisors (17256777988).

21644094092 is a wasteful number, since it uses less digits than its factorization.

21644094092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146243920 (or 146243918 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 41.

The spelling of 21644094092 in words is "twenty-one billion, six hundred forty-four million, ninety-four thousand, ninety-two".