21745719635371 has 2 divisors, whose sum is σ = 21745719635372. Its totient is φ = 21745719635370.

The previous prime is 21745719635309. The next prime is 21745719635389. The reversal of 21745719635371 is 17353691754712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21745719635371 - 2⁷ = 21745719635243 is a prime.

It is not a weakly prime, because it can be changed into another prime (21745719635071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10872859817685 + 10872859817686.

It is an arithmetic number, because the mean of its divisors is an integer number (10872859817686).

Almost surely, 2^{21745719635371} is an apocalyptic number.

21745719635371 is a deficient number, since it is larger than the sum of its proper divisors (1).

21745719635371 is an equidigital number, since it uses as much as digits as its factorization.

21745719635371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33339600, while the sum is 61.

The spelling of 21745719635371 in words is "twenty-one trillion, seven hundred forty-five billion, seven hundred nineteen million, six hundred thirty-five thousand, three hundred seventy-one".