2131023203261 has 2 divisors, whose sum is σ = 2131023203262. Its totient is φ = 2131023203260.

The previous prime is 2131023203219. The next prime is 2131023203279. The reversal of 2131023203261 is 1623023201312.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1655931448900 + 475091754361 = 1286830^2 + 689269^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131023203261 - 2²² = 2131019008957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2131023203261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2131023203291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065511601630 + 1065511601631.

It is an arithmetic number, because the mean of its divisors is an integer number (1065511601631).

Almost surely, 2^{2131023203261} is an apocalyptic number.

It is an amenable number.

2131023203261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131023203261 is an equidigital number, since it uses as much as digits as its factorization.

2131023203261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 2131023203261 its reverse (1623023201312), we get a palindrome (3754046404573).

The spelling of 2131023203261 in words is "two trillion, one hundred thirty-one billion, twenty-three million, two hundred three thousand, two hundred sixty-one".