21296236909 has 2 divisors, whose sum is σ = 21296236910. Its totient is φ = 21296236908.

The previous prime is 21296236903. The next prime is 21296236921. The reversal of 21296236909 is 90963269212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14684107684 + 6612129225 = 121178^2 + 81315^2 .

It is a cyclic number.

It is not a de Polignac number, because 21296236909 - 2²³ = 21287848301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21296236903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10648118454 + 10648118455.

It is an arithmetic number, because the mean of its divisors is an integer number (10648118455).

Almost surely, 2^21296236909 is an apocalyptic number.

It is an amenable number.

21296236909 is a deficient number, since it is larger than the sum of its proper divisors (1).

21296236909 is an equidigital number, since it uses as much as digits as its factorization.

21296236909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 629856, while the sum is 49.

The spelling of 21296236909 in words is "twenty-one billion, two hundred ninety-six million, two hundred thirty-six thousand, nine hundred nine".