213131131320 has 128 divisors (see below), whose sum is σ = 654350400000. Its totient is φ = 55520156160.

The previous prime is 213131131319. The next prime is 213131131351. The reversal of 213131131320 is 23131131312.

It is a happy number.

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, 813931 + ... + 1043429.

It is an arithmetic number, because the mean of its divisors is an integer number (5112112500).

Almost surely, 2^213131131320 is an apocalyptic number.

213131131320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 213131131320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (327175200000).

213131131320 is an abundant number, since it is smaller than the sum of its proper divisors (441219268680).

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

213131131320 is a wasteful number, since it uses less digits than its factorization.

213131131320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229693 (or 229689 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 213131131320 its reverse (23131131312), we get a palindrome (236262262632).

The spelling of 213131131320 in words is "two hundred thirteen billion, one hundred thirty-one million, one hundred thirty-one thousand, three hundred twenty".