21706794468 has 18 divisors (see below), whose sum is σ = 54869952774. Its totient is φ = 7235598144.

The previous prime is 21706794413. The next prime is 21706794481. The reversal of 21706794468 is 86449760712.

21706794468 is a `hidden beast` number, since 2 + 170 + 6 + 7 + 9 + 4 + 468 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20558397924 + 1148396544 = 143382^2 + 33888^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 301483221 + ... + 301483292.

Almost surely, 2^21706794468 is an apocalyptic number.

It is an amenable number.

21706794468 is an abundant number, since it is smaller than the sum of its proper divisors (33163158306).

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

21706794468 is a wasteful number, since it uses less digits than its factorization.

21706794468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602966523 (or 602966518 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 54.

The spelling of 21706794468 in words is "twenty-one billion, seven hundred six million, seven hundred ninety-four thousand, four hundred sixty-eight".