21745719635356 has 12 divisors (see below), whose sum is σ = 38057551721280. Its totient is φ = 10872133429280.

The previous prime is 21745719635309. The next prime is 21745719635371. The reversal of 21745719635356 is 65353691754712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181529740 + ... + 181649491.

It is an arithmetic number, because the mean of its divisors is an integer number (3171462643440).

Almost surely, 2^{21745719635356} is an apocalyptic number.

It is an amenable number.

21745719635356 is a deficient number, since it is larger than the sum of its proper divisors (16311832085924).

21745719635356 is a wasteful number, since it uses less digits than its factorization.

21745719635356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363194204 (or 363194202 counting only the distinct ones).

The product of its digits is 142884000, while the sum is 64.

The spelling of 21745719635356 in words is "twenty-one trillion, seven hundred forty-five billion, seven hundred nineteen million, six hundred thirty-five thousand, three hundred fifty-six".