21120208 has 20 divisors (see below), whose sum is σ = 41023168. Its totient is φ = 10533600.

The previous prime is 21120193. The next prime is 21120223. The reversal of 21120208 is 80202112.

It is an interprime number because it is at equal distance from previous prime (21120193) and next prime (21120223).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 21120191 and 21120200.

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, 5983 + ... + 8833.

Almost surely, 2^21120208 is an apocalyptic number.

It is an amenable number.

21120208 is a deficient number, since it is larger than the sum of its proper divisors (19902960).

21120208 is a wasteful number, since it uses less digits than its factorization.

21120208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3322 (or 3316 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 21120208 is about 4595.6727472700. The cubic root of 21120208 is about 276.4178366268.

The spelling of 21120208 in words is "twenty-one million, one hundred twenty thousand, two hundred eight".