1211212212 has 24 divisors (see below), whose sum is σ = 3229899456. Its totient is φ = 346060608.

The previous prime is 1211212199. The next prime is 1211212213. The reversal of 1211212212 is 2122121121.

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 = 1211212191 and 1211212200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211212213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7209513 + ... + 7209680.

It is an arithmetic number, because the mean of its divisors is an integer number (134579144).

Almost surely, 2^1211212212 is an apocalyptic number.

1211212212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211212212 is an abundant number, since it is smaller than the sum of its proper divisors (2018687244).

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

1211212212 is a wasteful number, since it uses less digits than its factorization.

1211212212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14419207 (or 14419205 counting only the distinct ones).

The product of its digits is 32, while the sum is 15.

The square root of 1211212212 is about 34802.4742223883. The cubic root of 1211212212 is about 1065.9579680869.

Adding to 1211212212 its reverse (2122121121), we get a palindrome (3333333333).

The spelling of 1211212212 in words is "one billion, two hundred eleven million, two hundred twelve thousand, two hundred twelve".