21413040031220 has 24 divisors (see below), whose sum is σ = 45071234855304. Its totient is φ = 8545434909696.

The previous prime is 21413040031193. The next prime is 21413040031249. The reversal of 21413040031220 is 2213004031412.

It can be written as a sum of positive squares in 4 ways, for example, as 551294370064 + 20861745661156 = 742492^2 + 4567466^2 .

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1236310049 + ... + 1236327368.

It is an arithmetic number, because the mean of its divisors is an integer number (1877968118971).

Almost surely, 2^{21413040031220} is an apocalyptic number.

21413040031220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21413040031220 is an abundant number, since it is smaller than the sum of its proper divisors (23658194824084).

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

21413040031220 is a wasteful number, since it uses less digits than its factorization.

21413040031220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2472637859 (or 2472637857 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21413040031220 its reverse (2213004031412), we get a palindrome (23626044062632).

The spelling of 21413040031220 in words is "twenty-one trillion, four hundred thirteen billion, forty million, thirty-one thousand, two hundred twenty".