22021400 has 48 divisors (see below), whose sum is σ = 51745200. Its totient is φ = 8714880.

The previous prime is 22021397. The next prime is 22021403. The reversal of 22021400 is 412022.

It is an interprime number because it is at equal distance from previous prime (22021397) and next prime (22021403).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20066 + ... + 21134.

It is an arithmetic number, because the mean of its divisors is an integer number (1078025).

Almost surely, 2^22021400 is an apocalyptic number.

22021400 is a gapful number since it is divisible by the number (20) 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 22021400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25872600).

22021400 is an abundant number, since it is smaller than the sum of its proper divisors (29723800).

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

22021400 is a wasteful number, since it uses less digits than its factorization.

22021400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1188 (or 1179 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 22021400 is about 4692.6964530001. The cubic root of 22021400 is about 280.2947576253.

Adding to 22021400 its reverse (412022), we get a palindrome (22433422).

The spelling of 22021400 in words is "twenty-two million, twenty-one thousand, four hundred".