21363342 has 64 divisors (see below), whose sum is σ = 57383424. Its totient is φ = 5120640.

The previous prime is 21363323. The next prime is 21363347. The reversal of 21363342 is 24336312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21363347) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4228 + ... + 7784.

It is an arithmetic number, because the mean of its divisors is an integer number (896616).

Almost surely, 2^21363342 is an apocalyptic number.

21363342 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 21363342, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28691712).

21363342 is an abundant number, since it is smaller than the sum of its proper divisors (36020082).

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

21363342 is a wasteful number, since it uses less digits than its factorization.

21363342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3593.

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

The square root of 21363342 is about 4622.0495453857. The cubic root of 21363342 is about 277.4744916087.

Adding to 21363342 its reverse (24336312), we get a palindrome (45699654).

It can be divided in two parts, 21 and 363342, that added together give a palindrome (363363).

The spelling of 21363342 in words is "twenty-one million, three hundred sixty-three thousand, three hundred forty-two".