21326022 has 48 divisors (see below), whose sum is σ = 48185280. Its totient is φ = 6811056.

The previous prime is 21326021. The next prime is 21326069. The reversal of 21326022 is 22062312.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21325986 and 21326004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21326021) 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 23 ways as a sum of consecutive naturals, for example, 45433 + ... + 45899.

It is an arithmetic number, because the mean of its divisors is an integer number (1003860).

Almost surely, 2^21326022 is an apocalyptic number.

21326022 is an abundant number, since it is smaller than the sum of its proper divisors (26859258).

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

21326022 is a wasteful number, since it uses less digits than its factorization.

21326022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577 (or 574 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 21326022 is about 4618.0106106418. The cubic root of 21326022 is about 277.3128223988.

Adding to 21326022 its reverse (22062312), we get a palindrome (43388334).

The spelling of 21326022 in words is "twenty-one million, three hundred twenty-six thousand, twenty-two".