21252885718 has 8 divisors (see below), whose sum is σ = 32419656360. Its totient is φ = 10446333600.

The previous prime is 21252885691. The next prime is 21252885721. The reversal of 21252885718 is 81758825212.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 90054483 + ... + 90054718.

It is an arithmetic number, because the mean of its divisors is an integer number (4052457045).

Almost surely, 2^21252885718 is an apocalyptic number.

21252885718 is a deficient number, since it is larger than the sum of its proper divisors (11166770642).

21252885718 is a wasteful number, since it uses less digits than its factorization.

21252885718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180109262.

The product of its digits is 716800, while the sum is 49.

The spelling of 21252885718 in words is "twenty-one billion, two hundred fifty-two million, eight hundred eighty-five thousand, seven hundred eighteen".