21670296618 has 8 divisors (see below), whose sum is σ = 43340593248. Its totient is φ = 7223432204.

The previous prime is 21670296577. The next prime is 21670296643. The reversal of 21670296618 is 81669207612.

It is a sphenic number, since it is the product of 3 distinct primes.

21670296618 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1805858046 + ... + 1805858057.

It is an arithmetic number, because the mean of its divisors is an integer number (5417574156).

Almost surely, 2^21670296618 is an apocalyptic number.

21670296618 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21670296618 is a wasteful number, since it uses less digits than its factorization.

21670296618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3611716108.

The product of its (nonzero) digits is 435456, while the sum is 48.

The spelling of 21670296618 in words is "twenty-one billion, six hundred seventy million, two hundred ninety-six thousand, six hundred eighteen".