2131121202321 has 16 divisors (see below), whose sum is σ = 2918489921984. Its totient is φ = 1382255181504.

The previous prime is 2131121202277. The next prime is 2131121202323. The reversal of 2131121202321 is 1232021211312.

It is not a de Polignac number, because 2131121202321 - 2⁹ = 2131121201809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2131121202323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1013175 + ... + 2299731.

It is an arithmetic number, because the mean of its divisors is an integer number (182405620124).

Almost surely, 2^{2131121202321} is an apocalyptic number.

It is an amenable number.

2131121202321 is a deficient number, since it is larger than the sum of its proper divisors (787368719663).

2131121202321 is a wasteful number, since it uses less digits than its factorization.

2131121202321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301520.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 2131121202321 its reverse (1232021211312), we get a palindrome (3363142413633).

The spelling of 2131121202321 in words is "two trillion, one hundred thirty-one billion, one hundred twenty-one million, two hundred two thousand, three hundred twenty-one".