19079426921 has 2 divisors, whose sum is σ = 19079426922. Its totient is φ = 19079426920.

The previous prime is 19079426869. The next prime is 19079426941. The reversal of 19079426921 is 12962497091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16181112025 + 2898314896 = 127205^2 + 53836^2 .

It is a cyclic number.

It is not a de Polignac number, because 19079426921 - 2⁶ = 19079426857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19079426921.

It is not a weakly prime, because it can be changed into another prime (19079426941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9539713460 + 9539713461.

It is an arithmetic number, because the mean of its divisors is an integer number (9539713461).

Almost surely, 2^19079426921 is an apocalyptic number.

It is an amenable number.

19079426921 is a deficient number, since it is larger than the sum of its proper divisors (1).

19079426921 is an equidigital number, since it uses as much as digits as its factorization.

19079426921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 50.

The spelling of 19079426921 in words is "nineteen billion, seventy-nine million, four hundred twenty-six thousand, nine hundred twenty-one".