21519008 has 48 divisors (see below), whose sum is σ = 51274944. Its totient is φ = 8678400.

The previous prime is 21518971. The next prime is 21519061. The reversal of 21519008 is 80091512.

It is a happy number.

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, 983 + ... + 6633.

It is an arithmetic number, because the mean of its divisors is an integer number (1068228).

Almost surely, 2^21519008 is an apocalyptic number.

21519008 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21519008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25637472).

21519008 is an abundant number, since it is smaller than the sum of its proper divisors (29755936).

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

21519008 is a wasteful number, since it uses less digits than its factorization.

21519008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5685 (or 5677 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 21519008 is about 4638.8584802729. The cubic root of 21519008 is about 278.1468092648.

The spelling of 21519008 in words is "twenty-one million, five hundred nineteen thousand, eight".