21887331839 has 8 divisors (see below), whose sum is σ = 22059164160. Its totient is φ = 21715571800.

The previous prime is 21887331811. The next prime is 21887331847. The reversal of 21887331839 is 93813378812.

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

It is a cyclic number.

It is not a de Polignac number, because 21887331839 - 2¹² = 21887327743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21887331889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 701432 + ... + 731970.

It is an arithmetic number, because the mean of its divisors is an integer number (2757395520).

Almost surely, 2^21887331839 is an apocalyptic number.

21887331839 is a deficient number, since it is larger than the sum of its proper divisors (171832321).

21887331839 is a wasteful number, since it uses less digits than its factorization.

21887331839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36141.

The product of its digits is 1741824, while the sum is 53.

The spelling of 21887331839 in words is "twenty-one billion, eight hundred eighty-seven million, three hundred thirty-one thousand, eight hundred thirty-nine".