21860421824 has 14 divisors (see below), whose sum is σ = 43379274684. Its totient is φ = 10930210880.

The previous prime is 21860421769. The next prime is 21860421827. The reversal of 21860421824 is 42812406812.

It is not an unprimeable number, because it can be changed into a prime (21860421827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170784482 + ... + 170784609.

Almost surely, 2^21860421824 is an apocalyptic number.

It is an amenable number.

21860421824 is a deficient number, since it is larger than the sum of its proper divisors (21518852860).

21860421824 is an equidigital number, since it uses as much as digits as its factorization.

21860421824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341569103 (or 341569093 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 38.

The spelling of 21860421824 in words is "twenty-one billion, eight hundred sixty million, four hundred twenty-one thousand, eight hundred twenty-four".