19621442339 has 2 divisors, whose sum is σ = 19621442340. Its totient is φ = 19621442338.

The previous prime is 19621442317. The next prime is 19621442341. The reversal of 19621442339 is 93324412691.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19621442339 - 2⁸ = 19621442083 is a prime.

It is a Sophie Germain prime.

Together with 19621442341, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19621442339.

It is not a weakly prime, because it can be changed into another prime (19621442039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9810721169 + 9810721170.

It is an arithmetic number, because the mean of its divisors is an integer number (9810721170).

Almost surely, 2^19621442339 is an apocalyptic number.

19621442339 is a deficient number, since it is larger than the sum of its proper divisors (1).

19621442339 is an equidigital number, since it uses as much as digits as its factorization.

19621442339 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 44.

The spelling of 19621442339 in words is "nineteen billion, six hundred twenty-one million, four hundred forty-two thousand, three hundred thirty-nine".