213131110044421 has 16 divisors (see below), whose sum is σ = 218408596358400. Its totient is φ = 207857402121600.

The previous prime is 213131110044373. The next prime is 213131110044481. The reversal of 213131110044421 is 124440011131312.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213131110044421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213131110044421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213131110044481) by changing a digit.

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, 2488672720 + ... + 2488758358.

It is an arithmetic number, because the mean of its divisors is an integer number (13650537272400).

Almost surely, 2^{213131110044421} is an apocalyptic number.

It is an amenable number.

213131110044421 is a deficient number, since it is larger than the sum of its proper divisors (5277486313979).

213131110044421 is a wasteful number, since it uses less digits than its factorization.

213131110044421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106980.

The product of its (nonzero) digits is 2304, while the sum is 28.

Adding to 213131110044421 its reverse (124440011131312), we get a palindrome (337571121175733).

The spelling of 213131110044421 in words is "two hundred thirteen trillion, one hundred thirty-one billion, one hundred ten million, forty-four thousand, four hundred twenty-one".