21312122311002 has 32 divisors (see below), whose sum is σ = 42694271409600. Its totient is φ = 7092370268928.

The previous prime is 21312122311001. The next prime is 21312122311061. The reversal of 21312122311002 is 20011322121312.

It is a self number, because there is not a number n which added to its sum of digits gives 21312122311002.

It is not an unprimeable number, because it can be changed into a prime (21312122311001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 215841748 + ... + 215940464.

It is an arithmetic number, because the mean of its divisors is an integer number (1334195981550).

Almost surely, 2^{21312122311002} is an apocalyptic number.

21312122311002 is an abundant number, since it is smaller than the sum of its proper divisors (21382149098598).

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

21312122311002 is a wasteful number, since it uses less digits than its factorization.

21312122311002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157470.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21312122311002 its reverse (20011322121312), we get a palindrome (41323444432314).

The spelling of 21312122311002 in words is "twenty-one trillion, three hundred twelve billion, one hundred twenty-two million, three hundred eleven thousand, two".