22121212 has 6 divisors (see below), whose sum is σ = 38712128. Its totient is φ = 11060604.

The previous prime is 22121201. The next prime is 22121213. The reversal of 22121212 is 21212122.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 22121192 and 22121201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121213) 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 as a sum of consecutive naturals, namely, 2765148 + ... + 2765155.

Almost surely, 2^22121212 is an apocalyptic number.

It is an amenable number.

22121212 is a deficient number, since it is larger than the sum of its proper divisors (16590916).

22121212 is a wasteful number, since it uses less digits than its factorization.

22121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5530307 (or 5530305 counting only the distinct ones).

The product of its digits is 32, while the sum is 13.

The square root of 22121212 is about 4703.3192534635. The cubic root of 22121212 is about 280.7175981078.

Adding to 22121212 its reverse (21212122), we get a palindrome (43333334).

It can be divided in two parts, 2 and 2121212, that multiplied together give a palindrome (4242424).

The spelling of 22121212 in words is "twenty-two million, one hundred twenty-one thousand, two hundred twelve".