21104464 has 20 divisors (see below), whose sum is σ = 41502304. Its totient is φ = 10394208.

The previous prime is 21104453. The next prime is 21104491. The reversal of 21104464 is 46440112.

It is a congruent number.

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, 8772 + ... + 10915.

Almost surely, 2^21104464 is an apocalyptic number.

It is an amenable number.

21104464 is a deficient number, since it is larger than the sum of its proper divisors (20397840).

21104464 is a wasteful number, since it uses less digits than its factorization.

21104464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19762 (or 19756 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 21104464 is about 4593.9595122291. The cubic root of 21104464 is about 276.3491345849.

Adding to 21104464 its reverse (46440112), we get a palindrome (67544576).

The spelling of 21104464 in words is "twenty-one million, one hundred four thousand, four hundred sixty-four".