21626332 has 96 divisors (see below), whose sum is σ = 50803200. Its totient is φ = 7817472.

The previous prime is 21626321. The next prime is 21626359. The reversal of 21626332 is 23362612.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21626297 and 21626306.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 366519 + ... + 366577.

It is an arithmetic number, because the mean of its divisors is an integer number (529200).

Almost surely, 2^21626332 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21626332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25401600).

21626332 is an abundant number, since it is smaller than the sum of its proper divisors (29176868).

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

21626332 is a wasteful number, since it uses less digits than its factorization.

21626332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 153 counting only the distinct ones).

The product of its digits is 2592, while the sum is 25.

The square root of 21626332 is about 4650.4120247565. The cubic root of 21626332 is about 278.6084528730.

Adding to 21626332 its reverse (23362612), we get a palindrome (44988944).

The spelling of 21626332 in words is "twenty-one million, six hundred twenty-six thousand, three hundred thirty-two".