21645071124724 has 24 divisors (see below), whose sum is σ = 37925988055200. Its totient is φ = 10809075219360.

The previous prime is 21645071124689. The next prime is 21645071124731. The reversal of 21645071124724 is 42742117054612.

It is a congruent number.

It is an unprimeable number.

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, 197835867 + ... + 197945245.

It is an arithmetic number, because the mean of its divisors is an integer number (1580249502300).

Almost surely, 2^{21645071124724} is an apocalyptic number.

It is an amenable number.

21645071124724 is a deficient number, since it is larger than the sum of its proper divisors (16280916930476).

21645071124724 is a wasteful number, since it uses less digits than its factorization.

21645071124724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170463 (or 170461 counting only the distinct ones).

The product of its (nonzero) digits is 752640, while the sum is 46.

The spelling of 21645071124724 in words is "twenty-one trillion, six hundred forty-five billion, seventy-one million, one hundred twenty-four thousand, seven hundred twenty-four".