21164012026523 has 8 divisors (see below), whose sum is σ = 22292651243520. Its totient is φ = 20036847194280.

The previous prime is 21164012026513. The next prime is 21164012026559. The reversal of 21164012026523 is 32562021046112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21164012026523 - 2²⁴ = 21163995249307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21164012026513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 368566715 + ... + 368624132.

It is an arithmetic number, because the mean of its divisors is an integer number (2786581405440).

Almost surely, 2^{21164012026523} is an apocalyptic number.

21164012026523 is a deficient number, since it is larger than the sum of its proper divisors (1128639216997).

21164012026523 is a wasteful number, since it uses less digits than its factorization.

21164012026523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737192377.

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

The spelling of 21164012026523 in words is "twenty-one trillion, one hundred sixty-four billion, twelve million, twenty-six thousand, five hundred twenty-three".