21000023100239 has 2 divisors, whose sum is σ = 21000023100240. Its totient is φ = 21000023100238.

The previous prime is 21000023100137. The next prime is 21000023100269. The reversal of 21000023100239 is 93200132000012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21000023100239 - 2²⁸ = 20999754664783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000023100269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500011550119 + 10500011550120.

It is an arithmetic number, because the mean of its divisors is an integer number (10500011550120).

Almost surely, 2^{21000023100239} is an apocalyptic number.

21000023100239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000023100239 is an equidigital number, since it uses as much as digits as its factorization.

21000023100239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The spelling of 21000023100239 in words is "twenty-one trillion, twenty-three million, one hundred thousand, two hundred thirty-nine".