21232031937439 has 2 divisors, whose sum is σ = 21232031937440. Its totient is φ = 21232031937438.

The previous prime is 21232031937409. The next prime is 21232031937463. The reversal of 21232031937439 is 93473913023212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21232031937439 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21232031937392 and 21232031937401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21232031937409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616015968719 + 10616015968720.

It is an arithmetic number, because the mean of its divisors is an integer number (10616015968720).

Almost surely, 2^{21232031937439} is an apocalyptic number.

21232031937439 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232031937439 is an equidigital number, since it uses as much as digits as its factorization.

21232031937439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1469664, while the sum is 49.

The spelling of 21232031937439 in words is "twenty-one trillion, two hundred thirty-two billion, thirty-one million, nine hundred thirty-seven thousand, four hundred thirty-nine".