21939130507439 has 2 divisors, whose sum is σ = 21939130507440. Its totient is φ = 21939130507438.

The previous prime is 21939130507421. The next prime is 21939130507457. The reversal of 21939130507439 is 93470503193912.

It is a balanced prime because it is at equal distance from previous prime (21939130507421) and next prime (21939130507457).

It is a cyclic number.

It is not a de Polignac number, because 21939130507439 - 2²⁰ = 21939129458863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21939130507499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10969565253719 + 10969565253720.

It is an arithmetic number, because the mean of its divisors is an integer number (10969565253720).

Almost surely, 2^{21939130507439} is an apocalyptic number.

21939130507439 is a deficient number, since it is larger than the sum of its proper divisors (1).

21939130507439 is an equidigital number, since it uses as much as digits as its factorization.

21939130507439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5511240, while the sum is 56.

The spelling of 21939130507439 in words is "twenty-one trillion, nine hundred thirty-nine billion, one hundred thirty million, five hundred seven thousand, four hundred thirty-nine".