21294122008 has 16 divisors (see below), whose sum is σ = 39933101880. Its totient is φ = 10645294848.

The previous prime is 21294121999. The next prime is 21294122033. The reversal of 21294122008 is 80022149212.

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, 168810 + ... + 266617.

Almost surely, 2^21294122008 is an apocalyptic number.

It is an amenable number.

21294122008 is a deficient number, since it is larger than the sum of its proper divisors (18638979872).

21294122008 is a wasteful number, since it uses less digits than its factorization.

21294122008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441546 (or 441542 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The spelling of 21294122008 in words is "twenty-one billion, two hundred ninety-four million, one hundred twenty-two thousand, eight".