21334632 has 64 divisors (see below), whose sum is σ = 58613760. Its totient is φ = 6417600.

The previous prime is 21334631. The next prime is 21334657. The reversal of 21334632 is 23643312.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21334631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55513 + ... + 55895.

It is an arithmetic number, because the mean of its divisors is an integer number (915840).

Almost surely, 2^21334632 is an apocalyptic number.

21334632 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21334632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29306880).

21334632 is an abundant number, since it is smaller than the sum of its proper divisors (37279128).

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

21334632 is a wasteful number, since it uses less digits than its factorization.

21334632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614 (or 610 counting only the distinct ones).

The product of its digits is 2592, while the sum is 24.

The square root of 21334632 is about 4618.9427361681. The cubic root of 21334632 is about 277.3501374084.

Adding to 21334632 its reverse (23643312), we get a palindrome (44977944).

The spelling of 21334632 in words is "twenty-one million, three hundred thirty-four thousand, six hundred thirty-two".