21326214 has 64 divisors (see below), whose sum is σ = 53061120. Its totient is φ = 5564160.

The previous prime is 21326213. The next prime is 21326219. The reversal of 21326214 is 41262312.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21326213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75754 + ... + 76034.

It is an arithmetic number, because the mean of its divisors is an integer number (829080).

Almost surely, 2^21326214 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21326214, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26530560).

21326214 is an abundant number, since it is smaller than the sum of its proper divisors (31734906).

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

21326214 is a wasteful number, since it uses less digits than its factorization.

21326214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445.

The product of its digits is 576, while the sum is 21.

The square root of 21326214 is about 4618.0313987672. The cubic root of 21326214 is about 277.3136546200.

Adding to 21326214 its reverse (41262312), we get a palindrome (62588526).

The spelling of 21326214 in words is "twenty-one million, three hundred twenty-six thousand, two hundred fourteen".