21104100404 has 24 divisors (see below), whose sum is σ = 37990622208. Its totient is φ = 10250543520.

The previous prime is 21104100359. The next prime is 21104100431. The reversal of 21104100404 is 40400140112.

It is a super-2 number, since 2×21104100404² (a number of 21 digits) contains 22 as substring.

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, 19604 + ... + 206379.

It is an arithmetic number, because the mean of its divisors is an integer number (1582942592).

Almost surely, 2^21104100404 is an apocalyptic number.

It is an amenable number.

21104100404 is a deficient number, since it is larger than the sum of its proper divisors (16886521804).

21104100404 is a wasteful number, since it uses less digits than its factorization.

21104100404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226655 (or 226653 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21104100404 its reverse (40400140112), we get a palindrome (61504240516).

The spelling of 21104100404 in words is "twenty-one billion, one hundred four million, one hundred thousand, four hundred four".