21010208 has 24 divisors (see below), whose sum is σ = 41892480. Its totient is φ = 10370880.

The previous prime is 21010193. The next prime is 21010217. The reversal of 21010208 is 80201012.

It is a junction number, because it is equal to n+sod(n) for n = 21010192 and 21010201.

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, 1628 + ... + 6683.

It is an arithmetic number, because the mean of its divisors is an integer number (1745520).

Almost surely, 2^21010208 is an apocalyptic number.

It is an amenable number.

21010208 is a deficient number, since it is larger than the sum of its proper divisors (20882272).

21010208 is an equidigital number, since it uses as much as digits as its factorization.

21010208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8400 (or 8392 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 21010208 is about 4583.6893437492. The cubic root of 21010208 is about 275.9371137269.

The spelling of 21010208 in words is "twenty-one million, ten thousand, two hundred eight".