121201212 has 48 divisors (see below), whose sum is σ = 311601024. Its totient is φ = 36360000.

The previous prime is 121201193. The next prime is 121201217. The reversal of 121201212 is 212102121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121201217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8787 + ... + 17877.

It is an arithmetic number, because the mean of its divisors is an integer number (6491688).

Almost surely, 2^121201212 is an apocalyptic number.

121201212 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 121201212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155800512).

121201212 is an abundant number, since it is smaller than the sum of its proper divisors (190399812).

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

121201212 is a wasteful number, since it uses less digits than its factorization.

121201212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9210 (or 9208 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 121201212 is about 11009.1422009165. The cubic root of 121201212 is about 494.8827556215.

121201212 divided by its sum of digits (12) gives a palindrome (10100101).

Adding to 121201212 its reverse (212102121), we get a palindrome (333303333).

Subtracting 121201212 from its reverse (212102121), we obtain a palindrome (90900909).

The spelling of 121201212 in words is "one hundred twenty-one million, two hundred one thousand, two hundred twelve".