21104252 has 24 divisors (see below), whose sum is σ = 40155696. Its totient is φ = 9646848.

The previous prime is 21104249. The next prime is 21104267. The reversal of 21104252 is 25240112.

It is a self number, because there is not a number n which added to its sum of digits gives 21104252.

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, 3668 + ... + 7460.

It is an arithmetic number, because the mean of its divisors is an integer number (1673154).

Almost surely, 2^21104252 is an apocalyptic number.

It is an amenable number.

21104252 is a deficient number, since it is larger than the sum of its proper divisors (19051444).

21104252 is a wasteful number, since it uses less digits than its factorization.

21104252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3917 (or 3915 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21104252 is about 4593.9364383935. The cubic root of 21104252 is about 276.3482092481.

Adding to 21104252 its reverse (25240112), we get a palindrome (46344364).

The spelling of 21104252 in words is "twenty-one million, one hundred four thousand, two hundred fifty-two".