21108452 has 12 divisors (see below), whose sum is σ = 37726080. Its totient is φ = 10329576.

The previous prime is 21108431. The next prime is 21108497. The reversal of 21108452 is 25480112.

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, 55952 + ... + 56327.

It is an arithmetic number, because the mean of its divisors is an integer number (3143840).

Almost surely, 2^21108452 is an apocalyptic number.

It is an amenable number.

21108452 is a deficient number, since it is larger than the sum of its proper divisors (16617628).

21108452 is a wasteful number, since it uses less digits than its factorization.

21108452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112330 (or 112328 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 21108452 is about 4594.3935399572. The cubic root of 21108452 is about 276.3665402380.

Adding to 21108452 its reverse (25480112), we get a palindrome (46588564).

The spelling of 21108452 in words is "twenty-one million, one hundred eight thousand, four hundred fifty-two".