21606152 has 16 divisors (see below), whose sum is σ = 41083200. Its totient is φ = 10650640.

The previous prime is 21606149. The next prime is 21606161. The reversal of 21606152 is 25160612.

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 3 ways as a sum of consecutive naturals, for example, 18452 + ... + 19587.

It is an arithmetic number, because the mean of its divisors is an integer number (2567700).

Almost surely, 2^21606152 is an apocalyptic number.

It is an amenable number.

21606152 is a deficient number, since it is larger than the sum of its proper divisors (19477048).

21606152 is a wasteful number, since it uses less digits than its factorization.

21606152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38116 (or 38112 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 21606152 is about 4648.2418181502. The cubic root of 21606152 is about 278.5217673723.

Adding to 21606152 its reverse (25160612), we get a palindrome (46766764).

The spelling of 21606152 in words is "twenty-one million, six hundred six thousand, one hundred fifty-two".