21179275902 has 48 divisors (see below), whose sum is σ = 48394644480. Its totient is φ = 6940092312.

The previous prime is 21179275879. The next prime is 21179275907. The reversal of 21179275902 is 20957297112.

21179275902 is a `hidden beast` number, since 21 + 17 + 9 + 27 + 590 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21179275907) 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 23 ways as a sum of consecutive naturals, for example, 340638 + ... + 397985.

It is an arithmetic number, because the mean of its divisors is an integer number (1008221760).

Almost surely, 2^21179275902 is an apocalyptic number.

21179275902 is an abundant number, since it is smaller than the sum of its proper divisors (27215368578).

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

21179275902 is an equidigital number, since it uses as much as digits as its factorization.

21179275902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738699 (or 738687 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 45.

The spelling of 21179275902 in words is "twenty-one billion, one hundred seventy-nine million, two hundred seventy-five thousand, nine hundred two".