21871422464 has 22 divisors (see below), whose sum is σ = 43721488164. Its totient is φ = 10935710720.

The previous prime is 21871422451. The next prime is 21871422473. The reversal of 21871422464 is 46422417812.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10678382 + ... + 10680429.

Almost surely, 2^21871422464 is an apocalyptic number.

It is an amenable number.

21871422464 is a deficient number, since it is larger than the sum of its proper divisors (21850065700).

21871422464 is an equidigital number, since it uses as much as digits as its factorization.

21871422464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21358831 (or 21358813 counting only the distinct ones).

The product of its digits is 172032, while the sum is 41.

The spelling of 21871422464 in words is "twenty-one billion, eight hundred seventy-one million, four hundred twenty-two thousand, four hundred sixty-four".