19597921139 has 2 divisors, whose sum is σ = 19597921140. Its totient is φ = 19597921138.

The previous prime is 19597921009. The next prime is 19597921153. The reversal of 19597921139 is 93112979591.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19597921139 - 2¹² = 19597917043 is a prime.

It is not a weakly prime, because it can be changed into another prime (19597921639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9798960569 + 9798960570.

It is an arithmetic number, because the mean of its divisors is an integer number (9798960570).

Almost surely, 2^19597921139 is an apocalyptic number.

19597921139 is a deficient number, since it is larger than the sum of its proper divisors (1).

19597921139 is an equidigital number, since it uses as much as digits as its factorization.

19597921139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1377810, while the sum is 56.

The spelling of 19597921139 in words is "nineteen billion, five hundred ninety-seven million, nine hundred twenty-one thousand, one hundred thirty-nine".