21179785889472 has 112 divisors (see below), whose sum is σ = 66828144394752. Its totient is φ = 5788264458240.

The previous prime is 21179785889467. The next prime is 21179785889551. The reversal of 21179785889472 is 27498858797112.

It is a tau number, because it is divible by the number of its divisors (112).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 342551029 + ... + 342612852.

Almost surely, 2^{21179785889472} is an apocalyptic number.

It is an amenable number.

21179785889472 is an abundant number, since it is smaller than the sum of its proper divisors (45648358505280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21179785889472 is a wasteful number, since it uses less digits than its factorization.

21179785889472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685163926 (or 685163916 counting only the distinct ones).

The product of its digits is 1137991680, while the sum is 78.

The spelling of 21179785889472 in words is "twenty-one trillion, one hundred seventy-nine billion, seven hundred eighty-five million, eight hundred eighty-nine thousand, four hundred seventy-two".