21311130203021 has 2 divisors, whose sum is σ = 21311130203022. Its totient is φ = 21311130203020.

The previous prime is 21311130202991. The next prime is 21311130203047. The reversal of 21311130203021 is 12030203111312.

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., 13822074018025 + 7489056184996 = 3717805^2 + 2736614^2 .

It is a cyclic number.

It is not a de Polignac number, because 21311130203021 - 2³⁸ = 21036252296077 is a prime.

It is a super-2 number, since 2×21311130203021² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21311130202984 and 21311130203002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21311130203221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655565101510 + 10655565101511.

It is an arithmetic number, because the mean of its divisors is an integer number (10655565101511).

Almost surely, 2^{21311130203021} is an apocalyptic number.

It is an amenable number.

21311130203021 is a deficient number, since it is larger than the sum of its proper divisors (1).

21311130203021 is an equidigital number, since it uses as much as digits as its factorization.

21311130203021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21311130203021 its reverse (12030203111312), we get a palindrome (33341333314333).

The spelling of 21311130203021 in words is "twenty-one trillion, three hundred eleven billion, one hundred thirty million, two hundred three thousand, twenty-one".