2131220321013 has 32 divisors (see below), whose sum is σ = 3362150626560. Its totient is φ = 1174938670080.

The previous prime is 2131220320991. The next prime is 2131220321017. The reversal of 2131220321013 is 3101230221312.

It is not a de Polignac number, because 2131220321013 - 2²⁹ = 2130683450101 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131220321017) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 559218 + ... + 2138963.

It is an arithmetic number, because the mean of its divisors is an integer number (105067207080).

Almost surely, 2^{2131220321013} is an apocalyptic number.

It is an amenable number.

2131220321013 is a deficient number, since it is larger than the sum of its proper divisors (1230930305547).

2131220321013 is a wasteful number, since it uses less digits than its factorization.

2131220321013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2699517.

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

Adding to 2131220321013 its reverse (3101230221312), we get a palindrome (5232450542325).

The spelling of 2131220321013 in words is "two trillion, one hundred thirty-one billion, two hundred twenty million, three hundred twenty-one thousand, thirteen".