21310208 has 18 divisors (see below), whose sum is σ = 42537684. Its totient is φ = 10654976.

The previous prime is 21310207. The next prime is 21310243. The reversal of 21310208 is 80201312.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (21310207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41366 + ... + 41877.

Almost surely, 2^21310208 is an apocalyptic number.

It is an amenable number.

21310208 is a deficient number, since it is larger than the sum of its proper divisors (21227476).

21310208 is an frugal number, since it uses more digits than its factorization.

21310208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83259 (or 83245 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 21310208 is about 4616.2980839629. The cubic root of 21310208 is about 277.2442596917.

The spelling of 21310208 in words is "twenty-one million, three hundred ten thousand, two hundred eight".