21164267869902 has 96 divisors (see below), whose sum is σ = 49537006571520. Its totient is φ = 6510063389760.

The previous prime is 21164267869781. The next prime is 21164267869931. The reversal of 21164267869902 is 20996876246112.

21164267869902 is a `hidden beast` number, since 2 + 116 + 426 + 7 + 8 + 6 + 9 + 90 + 2 = 666.

It is a super-2 number, since 2×21164267869902² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21164267869902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2775918 + ... + 7073489.

It is an arithmetic number, because the mean of its divisors is an integer number (516010485120).

Almost surely, 2^{21164267869902} is an apocalyptic number.

21164267869902 is an abundant number, since it is smaller than the sum of its proper divisors (28372738701618).

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

21164267869902 is a wasteful number, since it uses less digits than its factorization.

21164267869902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9849598 (or 9849595 counting only the distinct ones).

The product of its (nonzero) digits is 31352832, while the sum is 63.

The spelling of 21164267869902 in words is "twenty-one trillion, one hundred sixty-four billion, two hundred sixty-seven million, eight hundred sixty-nine thousand, nine hundred two".