22000212 has 72 divisors (see below), whose sum is σ = 61992840. Its totient is φ = 6531840.

The previous prime is 22000211. The next prime is 22000243. The reversal of 22000212 is 21200022.

It can be written as a sum of positive squares in 4 ways, for example, as 2604996 + 19395216 = 1614^2 + 4404^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 22000194 and 22000203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22000211) 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 23 ways as a sum of consecutive naturals, for example, 12762 + ... + 14382.

Almost surely, 2^22000212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22000212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30996420).

22000212 is an abundant number, since it is smaller than the sum of its proper divisors (39992628).

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

22000212 is a wasteful number, since it uses less digits than its factorization.

22000212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1673 (or 1668 counting only the distinct ones).

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

The square root of 22000212 is about 4690.4383590449. The cubic root of 22000212 is about 280.2048331116.

Adding to 22000212 its reverse (21200022), we get a palindrome (43200234).

The spelling of 22000212 in words is "twenty-two million, two hundred twelve", and thus it is an aban number.