21415852 has 24 divisors (see below), whose sum is σ = 41410656. Its totient is φ = 9639168.

The previous prime is 21415847. The next prime is 21415871. The reversal of 21415852 is 25851412.

It is a self number, because there is not a number n which added to its sum of digits gives 21415852.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5283 + ... + 8410.

It is an arithmetic number, because the mean of its divisors is an integer number (1725444).

Almost surely, 2^21415852 is an apocalyptic number.

It is an amenable number.

21415852 is a deficient number, since it is larger than the sum of its proper divisors (19994804).

21415852 is a wasteful number, since it uses less digits than its factorization.

21415852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13737 (or 13735 counting only the distinct ones).

The product of its digits is 3200, while the sum is 28.

The square root of 21415852 is about 4627.7264396245. The cubic root of 21415852 is about 277.7016449608.

The spelling of 21415852 in words is "twenty-one million, four hundred fifteen thousand, eight hundred fifty-two".