21035608 has 48 divisors (see below), whose sum is σ = 44815680. Its totient is φ = 9240000.

The previous prime is 21035561. The next prime is 21035611. The reversal of 21035608 is 80653012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29658 + ... + 30358.

It is an arithmetic number, because the mean of its divisors is an integer number (933660).

Almost surely, 2^21035608 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 21035608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22407840).

21035608 is an abundant number, since it is smaller than the sum of its proper divisors (23780072).

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

21035608 is a wasteful number, since it uses less digits than its factorization.

21035608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760 (or 745 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 21035608 is about 4586.4592007343. The cubic root of 21035608 is about 276.0482657311.

The spelling of 21035608 in words is "twenty-one million, thirty-five thousand, six hundred eight".