21104625 has 32 divisors (see below), whose sum is σ = 35433216. Its totient is φ = 11155200.

The previous prime is 21104591. The next prime is 21104641. The reversal of 21104625 is 52640112.

It is not a de Polignac number, because 21104625 - 2⁶ = 21104561 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62457 + ... + 62793.

It is an arithmetic number, because the mean of its divisors is an integer number (1107288).

Almost surely, 2^21104625 is an apocalyptic number.

21104625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21104625 is a deficient number, since it is larger than the sum of its proper divisors (14328591).

21104625 is a wasteful number, since it uses less digits than its factorization.

21104625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522 (or 512 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 21104625 is about 4593.9770352060. The cubic root of 21104625 is about 276.3498373130.

Adding to 21104625 its reverse (52640112), we get a palindrome (73744737).

The spelling of 21104625 in words is "twenty-one million, one hundred four thousand, six hundred twenty-five".