19121634911 has 2 divisors, whose sum is σ = 19121634912. Its totient is φ = 19121634910.

The previous prime is 19121634859. The next prime is 19121634919. The reversal of 19121634911 is 11943612191.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19121634911 - 2²⁶ = 19054526047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19121634919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9560817455 + 9560817456.

It is an arithmetic number, because the mean of its divisors is an integer number (9560817456).

Almost surely, 2^19121634911 is an apocalyptic number.

19121634911 is a deficient number, since it is larger than the sum of its proper divisors (1).

19121634911 is an equidigital number, since it uses as much as digits as its factorization.

19121634911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 38.

The spelling of 19121634911 in words is "nineteen billion, one hundred twenty-one million, six hundred thirty-four thousand, nine hundred eleven".