21445182004 has 24 divisors (see below), whose sum is σ = 37794141000. Its totient is φ = 10646906880.

The previous prime is 21445181993. The next prime is 21445182019. The reversal of 21445182004 is 40028154412.

It can be written as a sum of positive squares in 4 ways, for example, as 448592400 + 20996589604 = 21180^2 + 144902^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2623684 + ... + 2631844.

It is an arithmetic number, because the mean of its divisors is an integer number (1574755875).

Almost surely, 2^21445182004 is an apocalyptic number.

It is an amenable number.

21445182004 is a deficient number, since it is larger than the sum of its proper divisors (16348958996).

21445182004 is a wasteful number, since it uses less digits than its factorization.

21445182004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12723 (or 12721 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 31.

The spelling of 21445182004 in words is "twenty-one billion, four hundred forty-five million, one hundred eighty-two thousand, four".