21442316839 has 2 divisors, whose sum is σ = 21442316840. Its totient is φ = 21442316838.

The previous prime is 21442316821. The next prime is 21442316843. The reversal of 21442316839 is 93861324412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21442316839 - 2⁷ = 21442316711 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21442316795 and 21442316804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21442316879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721158419 + 10721158420.

It is an arithmetic number, because the mean of its divisors is an integer number (10721158420).

Almost surely, 2^21442316839 is an apocalyptic number.

21442316839 is a deficient number, since it is larger than the sum of its proper divisors (1).

21442316839 is an equidigital number, since it uses as much as digits as its factorization.

21442316839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 43.

The spelling of 21442316839 in words is "twenty-one billion, four hundred forty-two million, three hundred sixteen thousand, eight hundred thirty-nine".