21894576738 has 8 divisors (see below), whose sum is σ = 43789153488. Its totient is φ = 7298192244.

The previous prime is 21894576733. The next prime is 21894576749. The reversal of 21894576738 is 83767549812.

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

21894576738 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21894576733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1824548056 + ... + 1824548067.

It is an arithmetic number, because the mean of its divisors is an integer number (5473644186).

Almost surely, 2^21894576738 is an apocalyptic number.

21894576738 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.

21894576738 is a wasteful number, since it uses less digits than its factorization.

21894576738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3649096128.

The product of its digits is 20321280, while the sum is 60.

The spelling of 21894576738 in words is "twenty-one billion, eight hundred ninety-four million, five hundred seventy-six thousand, seven hundred thirty-eight".