21023130113021 has 2 divisors, whose sum is σ = 21023130113022. Its totient is φ = 21023130113020.

The previous prime is 21023130113003. The next prime is 21023130113033. The reversal of 21023130113021 is 12031103132012.

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., 12068606520100 + 8954523592921 = 3473990^2 + 2992411^2 .

It is a cyclic number.

It is not a de Polignac number, because 21023130113021 - 2²⁶ = 21023063004157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21023130112984 and 21023130113002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21023130113071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511565056510 + 10511565056511.

It is an arithmetic number, because the mean of its divisors is an integer number (10511565056511).

Almost surely, 2^{21023130113021} is an apocalyptic number.

It is an amenable number.

21023130113021 is a deficient number, since it is larger than the sum of its proper divisors (1).

21023130113021 is an equidigital number, since it uses as much as digits as its factorization.

21023130113021 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21023130113021 its reverse (12031103132012), we get a palindrome (33054233245033).

The spelling of 21023130113021 in words is "twenty-one trillion, twenty-three billion, one hundred thirty million, one hundred thirteen thousand, twenty-one".