21331312297 has 8 divisors (see below), whose sum is σ = 22074870600. Its totient is φ = 20588287104.

The previous prime is 21331312279. The next prime is 21331312339. The reversal of 21331312297 is 79221313312.

It can be written as a sum of positive squares in 4 ways, for example, as 394379881 + 20936932416 = 19859^2 + 144696^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21331312297 - 2²³ = 21322923689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21331312237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50988 + ... + 212749.

It is an arithmetic number, because the mean of its divisors is an integer number (2759358825).

Almost surely, 2^21331312297 is an apocalyptic number.

It is an amenable number.

21331312297 is a deficient number, since it is larger than the sum of its proper divisors (743558303).

21331312297 is a wasteful number, since it uses less digits than its factorization.

21331312297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266555.

The product of its digits is 13608, while the sum is 34.

The spelling of 21331312297 in words is "twenty-one billion, three hundred thirty-one million, three hundred twelve thousand, two hundred ninety-seven".