21104412 has 48 divisors (see below), whose sum is σ = 59592960. Its totient is φ = 5674752.

The previous prime is 21104407. The next prime is 21104453. The reversal of 21104412 is 21440112.

It is a junction number, because it is equal to n+sod(n) for n = 21104391 and 21104400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5962 + ... + 8817.

It is an arithmetic number, because the mean of its divisors is an integer number (1241520).

Almost surely, 2^21104412 is an apocalyptic number.

It is an amenable number.

21104412 is an abundant number, since it is smaller than the sum of its proper divisors (38488548).

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

21104412 is a wasteful number, since it uses less digits than its factorization.

21104412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14810 (or 14808 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 21104412 is about 4593.9538526198. The cubic root of 21104412 is about 276.3489076161.

Adding to 21104412 its reverse (21440112), we get a palindrome (42544524).

The spelling of 21104412 in words is "twenty-one million, one hundred four thousand, four hundred twelve".