21110408 has 32 divisors (see below), whose sum is σ = 44241120. Its totient is φ = 9360000.

The previous prime is 21110393. The next prime is 21110423. The reversal of 21110408 is 80401112.

It is an interprime number because it is at equal distance from previous prime (21110393) and next prime (21110423).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 683 + ... + 6533.

It is an arithmetic number, because the mean of its divisors is an integer number (1382535).

Almost surely, 2^21110408 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 21110408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22120560).

21110408 is an abundant number, since it is smaller than the sum of its proper divisors (23130712).

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

21110408 is a wasteful number, since it uses less digits than its factorization.

21110408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5909 (or 5905 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 21110408 is about 4594.6064031645. The cubic root of 21110408 is about 276.3750764120.

The spelling of 21110408 in words is "twenty-one million, one hundred ten thousand, four hundred eight".