21320510023 has 2 divisors, whose sum is σ = 21320510024. Its totient is φ = 21320510022.

The previous prime is 21320510011. The next prime is 21320510041. The reversal of 21320510023 is 32001502312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21320510023 - 2¹³ = 21320501831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21320510093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660255011 + 10660255012.

It is an arithmetic number, because the mean of its divisors is an integer number (10660255012).

Almost surely, 2^21320510023 is an apocalyptic number.

21320510023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21320510023 is an equidigital number, since it uses as much as digits as its factorization.

21320510023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 19.

The spelling of 21320510023 in words is "twenty-one billion, three hundred twenty million, five hundred ten thousand, twenty-three".