21532255838 has 8 divisors (see below), whose sum is σ = 33340267200. Its totient is φ = 10418833440.

The previous prime is 21532255813. The next prime is 21532255847. The reversal of 21532255838 is 83855223512.

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, 173647163 + ... + 173647286.

It is an arithmetic number, because the mean of its divisors is an integer number (4167533400).

Almost surely, 2^21532255838 is an apocalyptic number.

21532255838 is a deficient number, since it is larger than the sum of its proper divisors (11808011362).

21532255838 is a wasteful number, since it uses less digits than its factorization.

21532255838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347294482.

The product of its digits is 576000, while the sum is 44.

The spelling of 21532255838 in words is "twenty-one billion, five hundred thirty-two million, two hundred fifty-five thousand, eight hundred thirty-eight".