21220313300 has 36 divisors (see below), whose sum is σ = 46302528636. Its totient is φ = 8441222400.

The previous prime is 21220313209. The next prime is 21220313321. The reversal of 21220313300 is 331302212.

It can be written as a sum of positive squares in 6 ways, for example, as 5072003524 + 16148309776 = 71218^2 + 127076^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 568097 + ... + 604296.

It is an arithmetic number, because the mean of its divisors is an integer number (1286181351).

Almost surely, 2^21220313300 is an apocalyptic number.

21220313300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220313300 is an abundant number, since it is smaller than the sum of its proper divisors (25082215336).

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

21220313300 is a wasteful number, since it uses less digits than its factorization.

21220313300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1172588 (or 1172581 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21220313300 its reverse (331302212), we get a palindrome (21551615512).

The spelling of 21220313300 in words is "twenty-one billion, two hundred twenty million, three hundred thirteen thousand, three hundred".