21745719635355 has 12 divisors (see below), whose sum is σ = 37692580701360. Its totient is φ = 11597717138832.

The previous prime is 21745719635309. The next prime is 21745719635371. The reversal of 21745719635355 is 55353691754712.

21745719635355 is a `hidden beast` number, since 2 + 1 + 7 + 4 + 5 + 7 + 1 + 96 + 3 + 535 + 5 = 666.

It is not a de Polignac number, because 21745719635355 - 2⁶ = 21745719635291 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21745719635292 and 21745719635301.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 241619107015 + ... + 241619107104.

It is an arithmetic number, because the mean of its divisors is an integer number (3141048391780).

Almost surely, 2^{21745719635355} is an apocalyptic number.

21745719635355 is a deficient number, since it is larger than the sum of its proper divisors (15946861066005).

21745719635355 is a wasteful number, since it uses less digits than its factorization.

21745719635355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483238214130 (or 483238214127 counting only the distinct ones).

The product of its digits is 119070000, while the sum is 63.

The spelling of 21745719635355 in words is "twenty-one trillion, seven hundred forty-five billion, seven hundred nineteen million, six hundred thirty-five thousand, three hundred fifty-five".