21102110039 has 2 divisors, whose sum is σ = 21102110040. Its totient is φ = 21102110038.

The previous prime is 21102110033. The next prime is 21102110123. The reversal of 21102110039 is 93001120112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21102110039 - 2²⁸ = 20833674583 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21102110039.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21102110033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551055019 + 10551055020.

It is an arithmetic number, because the mean of its divisors is an integer number (10551055020).

Almost surely, 2^21102110039 is an apocalyptic number.

21102110039 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102110039 is an equidigital number, since it uses as much as digits as its factorization.

21102110039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 20.

The spelling of 21102110039 in words is "twenty-one billion, one hundred two million, one hundred ten thousand, thirty-nine".