2131110213021 has 6 divisors (see below), whose sum is σ = 3078270307710. Its totient is φ = 1420740142008.

The previous prime is 2131110213007. The next prime is 2131110213103. The reversal of 2131110213021 is 1203120111312.

2131110213021 is a `hidden beast` number, since 21 + 311 + 10 + 21 + 302 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1109219708025 + 1021890504996 = 1053195^2 + 1010886^2 .

It is not a de Polignac number, because 2131110213021 - 2⁷ = 2131110212893 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2131110212985 and 2131110213003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131110218021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 118395011826 + ... + 118395011843.

It is an arithmetic number, because the mean of its divisors is an integer number (513045051285).

Almost surely, 2^{2131110213021} is an apocalyptic number.

It is an amenable number.

2131110213021 is a deficient number, since it is larger than the sum of its proper divisors (947160094689).

2131110213021 is a wasteful number, since it uses less digits than its factorization.

2131110213021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236790023675 (or 236790023672 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 2131110213021 its reverse (1203120111312), we get a palindrome (3334230324333).

The spelling of 2131110213021 in words is "two trillion, one hundred thirty-one billion, one hundred ten million, two hundred thirteen thousand, twenty-one".