21652204 has 24 divisors (see below), whose sum is σ = 43642368. Its totient is φ = 9207120.

The previous prime is 21652201. The next prime is 21652217. The reversal of 21652204 is 40225612.

It is not an unprimeable number, because it can be changed into a prime (21652201) 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, 717 + ... + 6619.

It is an arithmetic number, because the mean of its divisors is an integer number (1818432).

Almost surely, 2^21652204 is an apocalyptic number.

It is an amenable number.

21652204 is an abundant number, since it is smaller than the sum of its proper divisors (21990164).

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

21652204 is a wasteful number, since it uses less digits than its factorization.

21652204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6045 (or 6043 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 21652204 is about 4653.1928823121. The cubic root of 21652204 is about 278.7195101616.

Adding to 21652204 its reverse (40225612), we get a palindrome (61877816).

The spelling of 21652204 in words is "twenty-one million, six hundred fifty-two thousand, two hundred four".