21235008 has 56 divisors (see below), whose sum is σ = 59151520. Its totient is φ = 6704640.

The previous prime is 21235001. The next prime is 21235009. The reversal of 21235008 is 80053212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21235001) 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, 738 + ... + 6558.

Almost surely, 2^21235008 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 21235008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29575760).

21235008 is an abundant number, since it is smaller than the sum of its proper divisors (37916512).

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

21235008 is a wasteful number, since it uses less digits than its factorization.

21235008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5855 (or 5845 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 21235008 is about 4608.1458310257. The cubic root of 21235008 is about 276.9177598219.

The spelling of 21235008 in words is "twenty-one million, two hundred thirty-five thousand, eight".