21231311132320 has 48 divisors (see below), whose sum is σ = 50159928322728. Its totient is φ = 8492362629120.

The previous prime is 21231311132249. The next prime is 21231311132347. The reversal of 21231311132320 is 2323111313212.

21231311132320 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 19463379239824 + 1767931892496 = 4411732^2 + 1329636^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7341280 + ... + 9816160.

Almost surely, 2^{21231311132320} is an apocalyptic number.

21231311132320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21231311132320 is an abundant number, since it is smaller than the sum of its proper divisors (28928617190408).

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

21231311132320 is a wasteful number, since it uses less digits than its factorization.

21231311132320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2528513 (or 2528505 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 21231311132320 its reverse (2323111313212), we get a palindrome (23554422445532).

The spelling of 21231311132320 in words is "twenty-one trillion, two hundred thirty-one billion, three hundred eleven million, one hundred thirty-two thousand, three hundred twenty".