21364123076564 has 12 divisors (see below), whose sum is σ = 38256685509504. Its totient is φ = 10433641502424.

The previous prime is 21364123076561. The next prime is 21364123076573. The reversal of 21364123076564 is 46567032146312.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21364123076561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62105008772 + ... + 62105009115.

It is an arithmetic number, because the mean of its divisors is an integer number (3188057125792).

Almost surely, 2^{21364123076564} is an apocalyptic number.

It is an amenable number.

21364123076564 is a deficient number, since it is larger than the sum of its proper divisors (16892562432940).

21364123076564 is a wasteful number, since it uses less digits than its factorization.

21364123076564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124210017934 (or 124210017932 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 50.

The spelling of 21364123076564 in words is "twenty-one trillion, three hundred sixty-four billion, one hundred twenty-three million, seventy-six thousand, five hundred sixty-four".