22021200 has 120 divisors (see below), whose sum is σ = 78417600. Its totient is φ = 5869440.

The previous prime is 22021177. The next prime is 22021211. The reversal of 22021200 is 212022.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9781 + ... + 11819.

It is an arithmetic number, because the mean of its divisors is an integer number (653480).

Almost surely, 2^22021200 is an apocalyptic number.

22021200 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 22021200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39208800).

22021200 is an abundant number, since it is smaller than the sum of its proper divisors (56396400).

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

22021200 is a wasteful number, since it uses less digits than its factorization.

22021200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2066 (or 2049 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 22021200 is about 4692.6751432419. The cubic root of 22021200 is about 280.2939090701.

Adding to 22021200 its reverse (212022), we get a palindrome (22233222).

It can be divided in two parts, 2 and 2021200, that added together give a palindrome (2021202).

The spelling of 22021200 in words is "twenty-two million, twenty-one thousand, two hundred".