121200211212 has 96 divisors (see below), whose sum is σ = 299788473600. Its totient is φ = 38052268800.

The previous prime is 121200211211. The next prime is 121200211219. The reversal of 121200211212 is 212112002121.

It is a junction number, because it is equal to n+sod(n) for n = 121200211191 and 121200211200.

It is not an unprimeable number, because it can be changed into a prime (121200211211) 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, 2667162 + ... + 2712222.

It is an arithmetic number, because the mean of its divisors is an integer number (3122796600).

Almost surely, 2^121200211212 is an apocalyptic number.

121200211212 is a gapful number since it is divisible by the number (12) 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 121200211212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149894236800).

121200211212 is an abundant number, since it is smaller than the sum of its proper divisors (178588262388).

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

121200211212 is a wasteful number, since it uses less digits than its factorization.

121200211212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45287 (or 45285 counting only the distinct ones).

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

Adding to 121200211212 its reverse (212112002121), we get a palindrome (333312213333).

The spelling of 121200211212 in words is "one hundred twenty-one billion, two hundred million, two hundred eleven thousand, two hundred twelve".