21888338842 has 8 divisors (see below), whose sum is σ = 32857748532. Its totient is φ = 10935756000.

The previous prime is 21888338837. The next prime is 21888338851. The reversal of 21888338842 is 24883388812.

It can be written as a sum of positive squares in 2 ways, for example, as 21216544281 + 671794561 = 145659^2 + 25919^2 .

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

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, 4203459 + ... + 4208662.

Almost surely, 2^21888338842 is an apocalyptic number.

21888338842 is a deficient number, since it is larger than the sum of its proper divisors (10969409690).

21888338842 is a wasteful number, since it uses less digits than its factorization.

21888338842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8413424.

The product of its digits is 4718592, while the sum is 55.

The spelling of 21888338842 in words is "twenty-one billion, eight hundred eighty-eight million, three hundred thirty-eight thousand, eight hundred forty-two".