2131231012021 has 4 divisors (see below), whose sum is σ = 2131634736000. Its totient is φ = 2130827288044.

The previous prime is 2131231011967. The next prime is 2131231012033. The reversal of 2131231012021 is 1202101321312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2131231012021 - 2¹⁵ = 2131230979253 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 2131231012021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131231012081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201854071 + ... + 201864628.

It is an arithmetic number, because the mean of its divisors is an integer number (532908684000).

Almost surely, 2^{2131231012021} is an apocalyptic number.

It is an amenable number.

2131231012021 is a deficient number, since it is larger than the sum of its proper divisors (403723979).

2131231012021 is an equidigital number, since it uses as much as digits as its factorization.

2131231012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403723978.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 2131231012021 its reverse (1202101321312), we get a palindrome (3333332333333).

The spelling of 2131231012021 in words is "two trillion, one hundred thirty-one billion, two hundred thirty-one million, twelve thousand, twenty-one".