21245708 has 24 divisors (see below), whose sum is σ = 41552784. Its totient is φ = 9420800.

The previous prime is 21245683. The next prime is 21245713. The reversal of 21245708 is 80754212.

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, 4085 + ... + 7692.

It is an arithmetic number, because the mean of its divisors is an integer number (1731366).

Almost surely, 2^21245708 is an apocalyptic number.

It is an amenable number.

21245708 is a deficient number, since it is larger than the sum of its proper divisors (20307076).

21245708 is a wasteful number, since it uses less digits than its factorization.

21245708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11833 (or 11831 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 21245708 is about 4609.3066723749. The cubic root of 21245708 is about 276.9642635717.

The spelling of 21245708 in words is "twenty-one million, two hundred forty-five thousand, seven hundred eight".