21207432447008 has 48 divisors (see below), whose sum is σ = 42345513745920. Its totient is φ = 10453053811200.

The previous prime is 21207432446999. The next prime is 21207432447023. The reversal of 21207432447008 is 80074423470212.

It is a self number, because there is not a number n which added to its sum of digits gives 21207432447008.

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, 17613713 + ... + 18779183.

It is an arithmetic number, because the mean of its divisors is an integer number (882198203040).

Almost surely, 2^{21207432447008} is an apocalyptic number.

It is an amenable number.

21207432447008 is a deficient number, since it is larger than the sum of its proper divisors (21138081298912).

21207432447008 is a wasteful number, since it uses less digits than its factorization.

21207432447008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173561 (or 1173553 counting only the distinct ones).

The product of its (nonzero) digits is 602112, while the sum is 44.

The spelling of 21207432447008 in words is "twenty-one trillion, two hundred seven billion, four hundred thirty-two million, four hundred forty-seven thousand, eight".