21231130321020 has 96 divisors (see below), whose sum is σ = 59526007833600. Its totient is φ = 5654130659584.

The previous prime is 21231130320941. The next prime is 21231130321043. The reversal of 21231130321020 is 2012303113212.

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 31 ways as a sum of consecutive naturals, for example, 145858717 + ... + 146004203.

It is an arithmetic number, because the mean of its divisors is an integer number (620062581600).

Almost surely, 2^{21231130321020} is an apocalyptic number.

21231130321020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21231130321020 is an abundant number, since it is smaller than the sum of its proper divisors (38294877512580).

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

21231130321020 is a wasteful number, since it uses less digits than its factorization.

21231130321020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148707 (or 148705 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21231130321020 its reverse (2012303113212), we get a palindrome (23243433434232).

The spelling of 21231130321020 in words is "twenty-one trillion, two hundred thirty-one billion, one hundred thirty million, three hundred twenty-one thousand, twenty".