2131031311221 has 8 divisors (see below), whose sum is σ = 3008514792384. Its totient is φ = 1337117685440.

The previous prime is 2131031311177. The next prime is 2131031311247. The reversal of 2131031311221 is 1221131301312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2131031311221 - 2²⁹ = 2130494440309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131036311221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20892463785 + ... + 20892463886.

It is an arithmetic number, because the mean of its divisors is an integer number (376064349048).

Almost surely, 2^{2131031311221} is an apocalyptic number.

It is an amenable number.

2131031311221 is a deficient number, since it is larger than the sum of its proper divisors (877483481163).

2131031311221 is a wasteful number, since it uses less digits than its factorization.

2131031311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41784927691.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 2131031311221 its reverse (1221131301312), we get a palindrome (3352162612533).

Subtracting from 2131031311221 its reverse (1221131301312), we obtain a palindrome (909900009909).

The spelling of 2131031311221 in words is "two trillion, one hundred thirty-one billion, thirty-one million, three hundred eleven thousand, two hundred twenty-one".