21002231023 has 2 divisors, whose sum is σ = 21002231024. Its totient is φ = 21002231022.

The previous prime is 21002230943. The next prime is 21002231051. The reversal of 21002231023 is 32013220012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21002231023 - 2²⁵ = 20968676591 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21002230988 and 21002231006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21002231093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501115511 + 10501115512.

It is an arithmetic number, because the mean of its divisors is an integer number (10501115512).

Almost surely, 2^21002231023 is an apocalyptic number.

21002231023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002231023 is an equidigital number, since it uses as much as digits as its factorization.

21002231023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21002231023 its reverse (32013220012), we get a palindrome (53015451035).

The spelling of 21002231023 in words is "twenty-one billion, two million, two hundred thirty-one thousand, twenty-three".