12211812 has 36 divisors (see below), whose sum is σ = 31123456. Its totient is φ = 4037040.

The previous prime is 12211789. The next prime is 12211817. The reversal of 12211812 is 21811221.

12211812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (12211817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3237 + ... + 5907.

Almost surely, 2^12211812 is an apocalyptic number.

12211812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12211812 is an abundant number, since it is smaller than the sum of its proper divisors (18911644).

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

12211812 is a wasteful number, since it uses less digits than its factorization.

12211812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2808 (or 2803 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

The square root of 12211812 is about 3494.5403131170. The cubic root of 12211812 is about 230.2820232952.

The spelling of 12211812 in words is "twelve million, two hundred eleven thousand, eight hundred twelve".