212211121212 has 96 divisors (see below), whose sum is σ = 556174080000. Its totient is φ = 69968537856.

The previous prime is 212211121211. The next prime is 212211121219. The reversal of 212211121212 is 212121112212.

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

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 (212211121211) 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, 6072373 + ... + 6107219.

It is an arithmetic number, because the mean of its divisors is an integer number (5793480000).

Almost surely, 2^212211121212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212211121212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278087040000).

212211121212 is an abundant number, since it is smaller than the sum of its proper divisors (343962958788).

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

212211121212 is a wasteful number, since it uses less digits than its factorization.

212211121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35472 (or 35464 counting only the distinct ones).

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

Adding to 212211121212 its reverse (212121112212), we get a palindrome (424332233424).

The spelling of 212211121212 in words is "two hundred twelve billion, two hundred eleven million, one hundred twenty-one thousand, two hundred twelve".