2011221212 has 96 divisors (see below), whose sum is σ = 4974574080. Its totient is φ = 685221120.

The previous prime is 2011221203. The next prime is 2011221217. The reversal of 2011221212 is 2121221102.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011221217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62858 + ... + 89294.

It is an arithmetic number, because the mean of its divisors is an integer number (51818480).

Almost surely, 2^2011221212 is an apocalyptic number.

2011221212 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 2011221212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2487287040).

2011221212 is an abundant number, since it is smaller than the sum of its proper divisors (2963352868).

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

2011221212 is a wasteful number, since it uses less digits than its factorization.

2011221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26491 (or 26489 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 2011221212 is about 44846.6410336382. The cubic root of 2011221212 is about 1262.2729636772.

Adding to 2011221212 its reverse (2121221102), we get a palindrome (4132442314).

The spelling of 2011221212 in words is "two billion, eleven million, two hundred twenty-one thousand, two hundred twelve".