21745719635291 has 2 divisors, whose sum is σ = 21745719635292. Its totient is φ = 21745719635290.

The previous prime is 21745719635287. The next prime is 21745719635309. The reversal of 21745719635291 is 19253691754712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21745719635291 - 2² = 21745719635287 is a prime.

It is not a weakly prime, because it can be changed into another prime (21745719635221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10872859817645 + 10872859817646.

It is an arithmetic number, because the mean of its divisors is an integer number (10872859817646).

Almost surely, 2^{21745719635291} is an apocalyptic number.

21745719635291 is a deficient number, since it is larger than the sum of its proper divisors (1).

21745719635291 is an equidigital number, since it uses as much as digits as its factorization.

21745719635291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28576800, while the sum is 62.

The spelling of 21745719635291 in words is "twenty-one trillion, seven hundred forty-five billion, seven hundred nineteen million, six hundred thirty-five thousand, two hundred ninety-one".