21231958039 has 2 divisors, whose sum is σ = 21231958040. Its totient is φ = 21231958038.

The previous prime is 21231958031. The next prime is 21231958067. The reversal of 21231958039 is 93085913212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21231958039 - 2³ = 21231958031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21231957986 and 21231958004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21231958031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615979019 + 10615979020.

It is an arithmetic number, because the mean of its divisors is an integer number (10615979020).

Almost surely, 2^21231958039 is an apocalyptic number.

21231958039 is a deficient number, since it is larger than the sum of its proper divisors (1).

21231958039 is an equidigital number, since it uses as much as digits as its factorization.

21231958039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 43.

The spelling of 21231958039 in words is "twenty-one billion, two hundred thirty-one million, nine hundred fifty-eight thousand, thirty-nine".