21715827233 has 2 divisors, whose sum is σ = 21715827234. Its totient is φ = 21715827232.

The previous prime is 21715827121. The next prime is 21715827239. The reversal of 21715827233 is 33272851712.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20154629089 + 1561198144 = 141967^2 + 39512^2 .

It is a cyclic number.

It is not a de Polignac number, because 21715827233 - 2²⁴ = 21699050017 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21715827239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10857913616 + 10857913617.

It is an arithmetic number, because the mean of its divisors is an integer number (10857913617).

Almost surely, 2^21715827233 is an apocalyptic number.

It is an amenable number.

21715827233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21715827233 is an equidigital number, since it uses as much as digits as its factorization.

21715827233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 41.

The spelling of 21715827233 in words is "twenty-one billion, seven hundred fifteen million, eight hundred twenty-seven thousand, two hundred thirty-three".