21410208 has 72 divisors (see below), whose sum is σ = 64481508. Its totient is φ = 6715392.

The previous prime is 21410189. The next prime is 21410219. The reversal of 21410208 is 80201412.

It can be written as a sum of positive squares in 2 ways, for example, as 20684304 + 725904 = 4548^2 + 852^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2710 + ... + 7082.

Almost surely, 2^21410208 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 21410208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32240754).

21410208 is an abundant number, since it is smaller than the sum of its proper divisors (43071300).

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

21410208 is a wasteful number, since it uses less digits than its factorization.

21410208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4406 (or 4395 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 21410208 is about 4627.1165967587. The cubic root of 21410208 is about 277.6772473667.

The spelling of 21410208 in words is "twenty-one million, four hundred ten thousand, two hundred eight".