21312212130220 has 96 divisors (see below), whose sum is σ = 48925098815040. Its totient is φ = 7733910896640.

The previous prime is 21312212130217. The next prime is 21312212130257. The reversal of 21312212130220 is 2203121221312.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21312212130191 and 21312212130200.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 408339886 + ... + 408392074.

It is an arithmetic number, because the mean of its divisors is an integer number (509636445990).

Almost surely, 2^{21312212130220} is an apocalyptic number.

21312212130220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21312212130220 is an abundant number, since it is smaller than the sum of its proper divisors (27612886684820).

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

21312212130220 is a wasteful number, since it uses less digits than its factorization.

21312212130220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56003 (or 56001 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21312212130220 its reverse (2203121221312), we get a palindrome (23515333351532).

The spelling of 21312212130220 in words is "twenty-one trillion, three hundred twelve billion, two hundred twelve million, one hundred thirty thousand, two hundred twenty".