21682332 has 72 divisors (see below), whose sum is σ = 63190400. Its totient is φ = 6140448.

The previous prime is 21682321. The next prime is 21682337. The reversal of 21682332 is 23328612.

It is a junction number, because it is equal to n+sod(n) for n = 21682296 and 21682305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21682337) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34719 + ... + 35337.

Almost surely, 2^21682332 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 21682332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31595200).

21682332 is an abundant number, since it is smaller than the sum of its proper divisors (41508068).

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

21682332 is a wasteful number, since it uses less digits than its factorization.

21682332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775 (or 770 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 21682332 is about 4656.4291039379. The cubic root of 21682332 is about 278.8487251769.

The spelling of 21682332 in words is "twenty-one million, six hundred eighty-two thousand, three hundred thirty-two".