21008296 has 32 divisors (see below), whose sum is σ = 41277600. Its totient is φ = 10010560.

The previous prime is 21008293. The next prime is 21008329. The reversal of 21008296 is 69280012.

It is a happy number.

It is a super-3 number, since 3×21008296³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21008291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18711 + ... + 19801.

It is an arithmetic number, because the mean of its divisors is an integer number (1289925).

Almost surely, 2^21008296 is an apocalyptic number.

It is an amenable number.

21008296 is a deficient number, since it is larger than the sum of its proper divisors (20269304).

21008296 is a wasteful number, since it uses less digits than its factorization.

21008296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1209 (or 1205 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 21008296 is about 4583.4807733861. The cubic root of 21008296 is about 275.9287430693.

The spelling of 21008296 in words is "twenty-one million, eight thousand, two hundred ninety-six".