21818400404 has 12 divisors (see below), whose sum is σ = 38183982144. Its totient is φ = 10908691224.

The previous prime is 21818400403. The next prime is 21818400419. The reversal of 21818400404 is 40400481812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21818400403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20924 + ... + 209939.

It is an arithmetic number, because the mean of its divisors is an integer number (3181998512).

Almost surely, 2^21818400404 is an apocalyptic number.

It is an amenable number.

21818400404 is a deficient number, since it is larger than the sum of its proper divisors (16365581740).

21818400404 is a wasteful number, since it uses less digits than its factorization.

21818400404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254494 (or 254492 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 32.

The spelling of 21818400404 in words is "twenty-one billion, eight hundred eighteen million, four hundred thousand, four hundred four".