19136821211 has 2 divisors, whose sum is σ = 19136821212. Its totient is φ = 19136821210.

The previous prime is 19136821153. The next prime is 19136821229. The reversal of 19136821211 is 11212863191.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19136821211 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (19136821271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9568410605 + 9568410606.

It is an arithmetic number, because the mean of its divisors is an integer number (9568410606).

Almost surely, 2^19136821211 is an apocalyptic number.

19136821211 is a deficient number, since it is larger than the sum of its proper divisors (1).

19136821211 is an equidigital number, since it uses as much as digits as its factorization.

19136821211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 35.

The spelling of 19136821211 in words is "nineteen billion, one hundred thirty-six million, eight hundred twenty-one thousand, two hundred eleven".