21345653164 has 12 divisors (see below), whose sum is σ = 40750792488. Its totient is φ = 9702569600.

The previous prime is 21345653137. The next prime is 21345653183. The reversal of 21345653164 is 46135654312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242564197 + ... + 242564284.

It is an arithmetic number, because the mean of its divisors is an integer number (3395899374).

Almost surely, 2^21345653164 is an apocalyptic number.

It is an amenable number.

21345653164 is a deficient number, since it is larger than the sum of its proper divisors (19405139324).

21345653164 is a wasteful number, since it uses less digits than its factorization.

21345653164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485128496 (or 485128494 counting only the distinct ones).

The product of its digits is 259200, while the sum is 40.

The spelling of 21345653164 in words is "twenty-one billion, three hundred forty-five million, six hundred fifty-three thousand, one hundred sixty-four".