2131203030021 has 24 divisors (see below), whose sum is σ = 3320950407320. Its totient is φ = 1309236535296.

The previous prime is 2131203030017. The next prime is 2131203030049. The reversal of 2131203030021 is 1200303021312.

2131203030021 is a `hidden beast` number, since 2 + 1 + 312 + 0 + 30 + 300 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 70628909121 + 2060574120900 = 265761^2 + 1435470^2 .

It is not a de Polignac number, because 2131203030021 - 2² = 2131203030017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2131203029976 and 2131203030003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131203030221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15717076 + ... + 15852093.

Almost surely, 2^{2131203030021} is an apocalyptic number.

It is an amenable number.

2131203030021 is a deficient number, since it is larger than the sum of its proper divisors (1189747377299).

2131203030021 is a wasteful number, since it uses less digits than its factorization.

2131203030021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31569765 (or 31569762 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 2131203030021 its reverse (1200303021312), we get a palindrome (3331506051333).

The spelling of 2131203030021 in words is "two trillion, one hundred thirty-one billion, two hundred three million, thirty thousand, twenty-one".