21316644610297 has 2 divisors, whose sum is σ = 21316644610298. Its totient is φ = 21316644610296.

The previous prime is 21316644610291. The next prime is 21316644610361. The reversal of 21316644610297 is 79201644661312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20776859050896 + 539785559401 = 4558164^2 + 734701^2 .

It is a cyclic number.

It is not a de Polignac number, because 21316644610297 - 2⁷ = 21316644610169 is a prime.

It is not a weakly prime, because it can be changed into another prime (21316644610291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10658322305148 + 10658322305149.

It is an arithmetic number, because the mean of its divisors is an integer number (10658322305149).

Almost surely, 2^{21316644610297} is an apocalyptic number.

It is an amenable number.

21316644610297 is a deficient number, since it is larger than the sum of its proper divisors (1).

21316644610297 is an equidigital number, since it uses as much as digits as its factorization.

21316644610297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 52.

The spelling of 21316644610297 in words is "twenty-one trillion, three hundred sixteen billion, six hundred forty-four million, six hundred ten thousand, two hundred ninety-seven".