21565163202 has 32 divisors (see below), whose sum is σ = 47199737664. Its totient is φ = 6514276800.

The previous prime is 21565163197. The next prime is 21565163209. The reversal of 21565163202 is 20236156512.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (21565163209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 494449 + ... + 536292.

It is an arithmetic number, because the mean of its divisors is an integer number (1474991802).

Almost surely, 2^21565163202 is an apocalyptic number.

21565163202 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21565163202 is an abundant number, since it is smaller than the sum of its proper divisors (25634574462).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21565163202 is a wasteful number, since it uses less digits than its factorization.

21565163202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1031074.

The product of its (nonzero) digits is 21600, while the sum is 33.

The spelling of 21565163202 in words is "twenty-one billion, five hundred sixty-five million, one hundred sixty-three thousand, two hundred two".