21164265702 has 24 divisors (see below), whose sum is σ = 48553316136. Its totient is φ = 6639769536.

The previous prime is 21164265701. The next prime is 21164265709. The reversal of 21164265702 is 20756246112.

It is a happy number.

21164265702 is a `hidden beast` number, since 2 + 1 + 1 + 64 + 26 + 570 + 2 = 666.

It is a super-2 number, since 2×21164265702² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21164265701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34581828 + ... + 34582439.

It is an arithmetic number, because the mean of its divisors is an integer number (2023054839).

Almost surely, 2^21164265702 is an apocalyptic number.

21164265702 is an abundant number, since it is smaller than the sum of its proper divisors (27389050434).

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

21164265702 is a wasteful number, since it uses less digits than its factorization.

21164265702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69164292 (or 69164289 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The spelling of 21164265702 in words is "twenty-one billion, one hundred sixty-four million, two hundred sixty-five thousand, seven hundred two".