11221212 has 48 divisors (see below), whose sum is σ = 27238400. Its totient is φ = 3592512.

The previous prime is 11221211. The next prime is 11221219. The reversal of 11221212 is 21212211.

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

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221211) 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, 56289 + ... + 56487.

Almost surely, 2^11221212 is an apocalyptic number.

11221212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11221212 is an abundant number, since it is smaller than the sum of its proper divisors (16017188).

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

11221212 is a wasteful number, since it uses less digits than its factorization.

11221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370 (or 368 counting only the distinct ones).

The product of its digits is 16, while the sum is 12.

The square root of 11221212 is about 3349.8077556779. The cubic root of 11221212 is about 223.8789471356.

Adding to 11221212 its reverse (21212211), we get a palindrome (32433423).

Subtracting 11221212 from its reverse (21212211), we obtain a palindrome (9990999).

The spelling of 11221212 in words is "eleven million, two hundred twenty-one thousand, two hundred twelve".