221131213131320 has 64 divisors (see below), whose sum is σ = 517515649136640. Its totient is φ = 84945750364800.

The previous prime is 221131213131299. The next prime is 221131213131403. The reversal of 221131213131320 is 23131312131122.

It is a self number, because there is not a number n which added to its sum of digits gives 221131213131320.

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 15 ways as a sum of consecutive naturals, for example, 680492612 + ... + 680817491.

It is an arithmetic number, because the mean of its divisors is an integer number (8086182017760).

Almost surely, 2^{221131213131320} is an apocalyptic number.

221131213131320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221131213131320 is an abundant number, since it is smaller than the sum of its proper divisors (296384436005320).

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

221131213131320 is a wasteful number, since it uses less digits than its factorization.

221131213131320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361310276 (or 1361310272 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

Adding to 221131213131320 its reverse (23131312131122), we get a palindrome (244262525262442).

The spelling of 221131213131320 in words is "two hundred twenty-one trillion, one hundred thirty-one billion, two hundred thirteen million, one hundred thirty-one thousand, three hundred twenty".