21616852 has 12 divisors (see below), whose sum is σ = 38285856. Its totient is φ = 10678040.

The previous prime is 21616841. The next prime is 21616853. The reversal of 21616852 is 25861612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21616853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32224 + ... + 32887.

It is an arithmetic number, because the mean of its divisors is an integer number (3190488).

Almost surely, 2^21616852 is an apocalyptic number.

It is an amenable number.

21616852 is a deficient number, since it is larger than the sum of its proper divisors (16669004).

21616852 is a wasteful number, since it uses less digits than its factorization.

21616852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65198 (or 65196 counting only the distinct ones).

The product of its digits is 5760, while the sum is 31.

The square root of 21616852 is about 4649.3926485080. The cubic root of 21616852 is about 278.5677371666.

Adding to 21616852 its product of digits (5760), we get a palindrome (21622612).

The spelling of 21616852 in words is "twenty-one million, six hundred sixteen thousand, eight hundred fifty-two".