21312010297 has 2 divisors, whose sum is σ = 21312010298. Its totient is φ = 21312010296.

The previous prime is 21312010277. The next prime is 21312010337. The reversal of 21312010297 is 79201021312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21307532841 + 4477456 = 145971^2 + 2116^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21312010297 is a prime.

It is not a weakly prime, because it can be changed into another prime (21312010277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656005148 + 10656005149.

It is an arithmetic number, because the mean of its divisors is an integer number (10656005149).

Almost surely, 2^21312010297 is an apocalyptic number.

It is an amenable number.

21312010297 is a deficient number, since it is larger than the sum of its proper divisors (1).

21312010297 is an equidigital number, since it uses as much as digits as its factorization.

21312010297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 28.

The spelling of 21312010297 in words is "twenty-one billion, three hundred twelve million, ten thousand, two hundred ninety-seven".