21704720298 has 16 divisors (see below), whose sum is σ = 43595750016. Its totient is φ = 7203855200.

The previous prime is 21704720269. The next prime is 21704720309. The reversal of 21704720298 is 89202740712.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 7761378 + ... + 7764173.

It is an arithmetic number, because the mean of its divisors is an integer number (2724734376).

Almost surely, 2^21704720298 is an apocalyptic number.

21704720298 is an abundant number, since it is smaller than the sum of its proper divisors (21891029718).

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

21704720298 is a wasteful number, since it uses less digits than its factorization.

21704720298 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15525789.

The product of its (nonzero) digits is 112896, while the sum is 42.

The spelling of 21704720298 in words is "twenty-one billion, seven hundred four million, seven hundred twenty thousand, two hundred ninety-eight".