21356264163 has 48 divisors (see below), whose sum is σ = 31483261440. Its totient is φ = 12868128000.

The previous prime is 21356264123. The next prime is 21356264177. The reversal of 21356264163 is 36146265312.

It is not a de Polignac number, because 21356264163 - 2¹³ = 21356255971 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (21356264113) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5433583 + ... + 5437511.

It is an arithmetic number, because the mean of its divisors is an integer number (655901280).

Almost surely, 2^21356264163 is an apocalyptic number.

21356264163 is a deficient number, since it is larger than the sum of its proper divisors (10126997277).

21356264163 is a wasteful number, since it uses less digits than its factorization.

21356264163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4180 (or 4167 counting only the distinct ones).

The product of its digits is 155520, while the sum is 39.

The spelling of 21356264163 in words is "twenty-one billion, three hundred fifty-six million, two hundred sixty-four thousand, one hundred sixty-three".