21145861184 has 28 divisors (see below), whose sum is σ = 47955793344. Its totient is φ = 9062511744.

The previous prime is 21145861171. The next prime is 21145861229. The reversal of 21145861184 is 48116854112.

It is a tau number, because it is divible by the number of its divisors (28).

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, 23599844 + ... + 23600739.

Almost surely, 2^21145861184 is an apocalyptic number.

It is an amenable number.

21145861184 is an abundant number, since it is smaller than the sum of its proper divisors (26809932160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21145861184 is an equidigital number, since it uses as much as digits as its factorization.

21145861184 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47200602 (or 47200592 counting only the distinct ones).

The product of its digits is 61440, while the sum is 41.

The spelling of 21145861184 in words is "twenty-one billion, one hundred forty-five million, eight hundred sixty-one thousand, one hundred eighty-four".