21412731220 has 12 divisors (see below), whose sum is σ = 44966735604. Its totient is φ = 8565092480.

The previous prime is 21412731209. The next prime is 21412731229. The reversal of 21412731220 is 2213721412.

It can be written as a sum of positive squares in 2 ways, for example, as 12719779524 + 8692951696 = 112782^2 + 93236^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21412731229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 535318261 + ... + 535318300.

It is an arithmetic number, because the mean of its divisors is an integer number (3747227967).

Almost surely, 2^21412731220 is an apocalyptic number.

21412731220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21412731220 is an abundant number, since it is smaller than the sum of its proper divisors (23554004384).

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

21412731220 is a wasteful number, since it uses less digits than its factorization.

21412731220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070636570 (or 1070636568 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The spelling of 21412731220 in words is "twenty-one billion, four hundred twelve million, seven hundred thirty-one thousand, two hundred twenty".