21751570228 has 24 divisors (see below), whose sum is σ = 38556604800. Its totient is φ = 10735465728.

The previous prime is 21751570219. The next prime is 21751570241. The reversal of 21751570228 is 82207515712.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2099076 + ... + 2109412.

It is an arithmetic number, because the mean of its divisors is an integer number (1606525200).

Almost surely, 2^21751570228 is an apocalyptic number.

It is an amenable number.

21751570228 is a deficient number, since it is larger than the sum of its proper divisors (16805034572).

21751570228 is a wasteful number, since it uses less digits than its factorization.

21751570228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17079 (or 17077 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 40.

The spelling of 21751570228 in words is "twenty-one billion, seven hundred fifty-one million, five hundred seventy thousand, two hundred twenty-eight".