21578550712 has 16 divisors (see below), whose sum is σ = 40731327000. Its totient is φ = 10716863520.

The previous prime is 21578550709. The next prime is 21578550727. The reversal of 21578550712 is 21705587512.

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, 9050214 + ... + 9052597.

Almost surely, 2^21578550712 is an apocalyptic number.

It is an amenable number.

21578550712 is a deficient number, since it is larger than the sum of its proper divisors (19152776288).

21578550712 is a wasteful number, since it uses less digits than its factorization.

21578550712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18102966 (or 18102962 counting only the distinct ones).

The product of its (nonzero) digits is 196000, while the sum is 43.

The spelling of 21578550712 in words is "twenty-one billion, five hundred seventy-eight million, five hundred fifty thousand, seven hundred twelve".