21674335439 has 2 divisors, whose sum is σ = 21674335440. Its totient is φ = 21674335438.

The previous prime is 21674335391. The next prime is 21674335471. The reversal of 21674335439 is 93453347612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21674335439 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 21674335393 and 21674335402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21674332439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10837167719 + 10837167720.

It is an arithmetic number, because the mean of its divisors is an integer number (10837167720).

Almost surely, 2^21674335439 is an apocalyptic number.

21674335439 is a deficient number, since it is larger than the sum of its proper divisors (1).

21674335439 is an equidigital number, since it uses as much as digits as its factorization.

21674335439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 47.

The spelling of 21674335439 in words is "twenty-one billion, six hundred seventy-four million, three hundred thirty-five thousand, four hundred thirty-nine".