21310451023 has 2 divisors, whose sum is σ = 21310451024. Its totient is φ = 21310451022.

The previous prime is 21310451009. The next prime is 21310451083. The reversal of 21310451023 is 32015401312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21310451023 - 2⁵ = 21310450991 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21310450985 and 21310451003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21310451003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655225511 + 10655225512.

It is an arithmetic number, because the mean of its divisors is an integer number (10655225512).

Almost surely, 2^21310451023 is an apocalyptic number.

21310451023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310451023 is an equidigital number, since it uses as much as digits as its factorization.

21310451023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 21310451023 its reverse (32015401312), we get a palindrome (53325852335).

The spelling of 21310451023 in words is "twenty-one billion, three hundred ten million, four hundred fifty-one thousand, twenty-three".