21804750642 has 8 divisors (see below), whose sum is σ = 43609501296. Its totient is φ = 7268250212.

The previous prime is 21804750619. The next prime is 21804750659. The reversal of 21804750642 is 24605740812.

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

21804750642 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 21804750642.

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, 1817062548 + ... + 1817062559.

It is an arithmetic number, because the mean of its divisors is an integer number (5451187662).

Almost surely, 2^21804750642 is an apocalyptic number.

21804750642 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.

21804750642 is a wasteful number, since it uses less digits than its factorization.

21804750642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3634125112.

The product of its (nonzero) digits is 107520, while the sum is 39.

The spelling of 21804750642 in words is "twenty-one billion, eight hundred four million, seven hundred fifty thousand, six hundred forty-two".