1211210121212 has 96 divisors (see below), whose sum is σ = 2627693913600. Its totient is φ = 475685971200.

The previous prime is 1211210121211. The next prime is 1211210121259. The reversal of 1211210121212 is 2121210121121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211210121211) 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, 122948087 + ... + 122957937.

It is an arithmetic number, because the mean of its divisors is an integer number (27371811600).

Almost surely, 2^{1211210121212} 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 1211210121212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1313846956800).

1211210121212 is an abundant number, since it is smaller than the sum of its proper divisors (1416483792388).

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

1211210121212 is a wasteful number, since it uses less digits than its factorization.

1211210121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12291 (or 12289 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1211210121212 its reverse (2121210121121), we get a palindrome (3332420242333).

Subtracting 1211210121212 from its reverse (2121210121121), we obtain a palindrome (909999999909).

The spelling of 1211210121212 in words is "one trillion, two hundred eleven billion, two hundred ten million, one hundred twenty-one thousand, two hundred twelve".