21523565214664 has 16 divisors (see below), whose sum is σ = 41295212331120. Its totient is φ = 10511508593040.

The previous prime is 21523565214659. The next prime is 21523565214731. The reversal of 21523565214664 is 46641256532512.

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, 31284251422 + ... + 31284252109.

It is an arithmetic number, because the mean of its divisors is an integer number (2580950770695).

Almost surely, 2^{21523565214664} is an apocalyptic number.

It is an amenable number.

21523565214664 is a deficient number, since it is larger than the sum of its proper divisors (19771647116456).

21523565214664 is a wasteful number, since it uses less digits than its factorization.

21523565214664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62568503580 (or 62568503576 counting only the distinct ones).

The product of its digits is 10368000, while the sum is 52.

The spelling of 21523565214664 in words is "twenty-one trillion, five hundred twenty-three billion, five hundred sixty-five million, two hundred fourteen thousand, six hundred sixty-four".