21791159227 has 2 divisors, whose sum is σ = 21791159228. Its totient is φ = 21791159226.

The previous prime is 21791159209. The next prime is 21791159233. The reversal of 21791159227 is 72295119712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21791159227 - 2⁷ = 21791159099 is a prime.

It is not a weakly prime, because it can be changed into another prime (21791159627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10895579613 + 10895579614.

It is an arithmetic number, because the mean of its divisors is an integer number (10895579614).

Almost surely, 2^21791159227 is an apocalyptic number.

21791159227 is a deficient number, since it is larger than the sum of its proper divisors (1).

21791159227 is an equidigital number, since it uses as much as digits as its factorization.

21791159227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 158760, while the sum is 46.

The spelling of 21791159227 in words is "twenty-one billion, seven hundred ninety-one million, one hundred fifty-nine thousand, two hundred twenty-seven".