21329682 has 32 divisors (see below), whose sum is σ = 46911744. Its totient is φ = 6411600.

The previous prime is 21329663. The next prime is 21329683. The reversal of 21329682 is 28692312.

It is a happy number.

It is a super-2 number, since 2×21329682² = 909910668442248, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (21329683) 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, 7413 + ... + 9879.

It is an arithmetic number, because the mean of its divisors is an integer number (1465992).

Almost surely, 2^21329682 is an apocalyptic number.

21329682 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21329682, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23455872).

21329682 is an abundant number, since it is smaller than the sum of its proper divisors (25582062).

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

21329682 is a wasteful number, since it uses less digits than its factorization.

21329682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2614.

The product of its digits is 10368, while the sum is 33.

The square root of 21329682 is about 4618.4068681743. The cubic root of 21329682 is about 277.3286857553.

The spelling of 21329682 in words is "twenty-one million, three hundred twenty-nine thousand, six hundred eighty-two".