21856887334 has 8 divisors (see below), whose sum is σ = 32787650808. Its totient is φ = 10927670400.

The previous prime is 21856887323. The next prime is 21856887347. The reversal of 21856887334 is 43378865812.

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

It is a congruent number.

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, 350632 + ... + 408235.

It is an arithmetic number, because the mean of its divisors is an integer number (4098456351).

Almost surely, 2^21856887334 is an apocalyptic number.

21856887334 is a deficient number, since it is larger than the sum of its proper divisors (10930763474).

21856887334 is a wasteful number, since it uses less digits than its factorization.

21856887334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773270.

The product of its digits is 7741440, while the sum is 55.

The spelling of 21856887334 in words is "twenty-one billion, eight hundred fifty-six million, eight hundred eighty-seven thousand, three hundred thirty-four".