2131322221021 has 16 divisors (see below), whose sum is σ = 2493841782784. Its totient is φ = 1783361576304.

The previous prime is 2131322220997. The next prime is 2131322221037. The reversal of 2131322221021 is 1201222231312.

It is not a de Polignac number, because 2131322221021 - 2⁷ = 2131322220893 is a prime.

It is a super-4 number, since 4×2131322221021⁴ (a number of 50 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2131322220983 and 2131322221001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131322221051) 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, 1448961 + ... + 2522326.

It is an arithmetic number, because the mean of its divisors is an integer number (155865111424).

Almost surely, 2^{2131322221021} is an apocalyptic number.

It is an amenable number.

2131322221021 is a deficient number, since it is larger than the sum of its proper divisors (362519561763).

2131322221021 is a wasteful number, since it uses less digits than its factorization.

2131322221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3973120.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 2131322221021 its reverse (1201222231312), we get a palindrome (3332544452333).

The spelling of 2131322221021 in words is "two trillion, one hundred thirty-one billion, three hundred twenty-two million, two hundred twenty-one thousand, twenty-one".