22201212 has 48 divisors (see below), whose sum is σ = 57254400. Its totient is φ = 6639360.

The previous prime is 22201199. The next prime is 22201217. The reversal of 22201212 is 21210222.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22201217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9364 + ... + 11492.

It is an arithmetic number, because the mean of its divisors is an integer number (1192800).

Almost surely, 2^22201212 is an apocalyptic number.

22201212 is a gapful number since it is divisible by the number (22) 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 22201212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28627200).

22201212 is an abundant number, since it is smaller than the sum of its proper divisors (35053188).

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

22201212 is a wasteful number, since it uses less digits than its factorization.

22201212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2226 (or 2224 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 22201212 is about 4711.8162103376. The cubic root of 22201212 is about 281.0555902902.

Adding to 22201212 its reverse (21210222), we get a palindrome (43411434).

The spelling of 22201212 in words is "twenty-two million, two hundred one thousand, two hundred twelve".