21230312239 has 2 divisors, whose sum is σ = 21230312240. Its totient is φ = 21230312238.

The previous prime is 21230312227. The next prime is 21230312261. The reversal of 21230312239 is 93221303212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21230312239 - 2⁹ = 21230311727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21230312209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615156119 + 10615156120.

It is an arithmetic number, because the mean of its divisors is an integer number (10615156120).

Almost surely, 2^21230312239 is an apocalyptic number.

21230312239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230312239 is an equidigital number, since it uses as much as digits as its factorization.

21230312239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 28.

The spelling of 21230312239 in words is "twenty-one billion, two hundred thirty million, three hundred twelve thousand, two hundred thirty-nine".