21164356124 has 12 divisors (see below), whose sum is σ = 37038659448. Its totient is φ = 10581882000.

The previous prime is 21164356117. The next prime is 21164356153. The reversal of 21164356124 is 42165346112.

It is a congruent number.

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, 197474 + ... + 285174.

It is an arithmetic number, because the mean of its divisors is an integer number (3086554954).

Almost surely, 2^21164356124 is an apocalyptic number.

It is an amenable number.

21164356124 is a deficient number, since it is larger than the sum of its proper divisors (15874303324).

21164356124 is a wasteful number, since it uses less digits than its factorization.

21164356124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148036 (or 148034 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The spelling of 21164356124 in words is "twenty-one billion, one hundred sixty-four million, three hundred fifty-six thousand, one hundred twenty-four".