202102100131021 has 2 divisors, whose sum is σ = 202102100131022. Its totient is φ = 202102100131020.

The previous prime is 202102100130913. The next prime is 202102100131049. The reversal of 202102100131021 is 120131001201202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171056186534025 + 31045913596996 = 13078845^2 + 5571886^2 .

It is a cyclic number.

It is not a de Polignac number, because 202102100131021 - 2¹⁷ = 202102099999949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202102100130986 and 202102100131004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202102100131091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101051050065510 + 101051050065511.

It is an arithmetic number, because the mean of its divisors is an integer number (101051050065511).

Almost surely, 2^{202102100131021} is an apocalyptic number.

It is an amenable number.

202102100131021 is a deficient number, since it is larger than the sum of its proper divisors (1).

202102100131021 is an equidigital number, since it uses as much as digits as its factorization.

202102100131021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 202102100131021 its reverse (120131001201202), we get a palindrome (322233101332223).

The spelling of 202102100131021 in words is "two hundred two trillion, one hundred two billion, one hundred million, one hundred thirty-one thousand, twenty-one".