21034208 has 48 divisors (see below), whose sum is σ = 45405360. Its totient is φ = 9532416.

The previous prime is 21034201. The next prime is 21034229. The reversal of 21034208 is 80243012.

It is a self number, because there is not a number n which added to its sum of digits gives 21034208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034201) 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, 24116 + ... + 24972.

It is an arithmetic number, because the mean of its divisors is an integer number (945945).

Almost surely, 2^21034208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21034208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22702680).

21034208 is an abundant number, since it is smaller than the sum of its proper divisors (24371152).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21034208 is a wasteful number, since it uses less digits than its factorization.

21034208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939 (or 931 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 21034208 is about 4586.3065750122. The cubic root of 21034208 is about 276.0421415733.

The spelling of 21034208 in words is "twenty-one million, thirty-four thousand, two hundred eight".