121213212 has 12 divisors (see below), whose sum is σ = 282830856. Its totient is φ = 40404400.

The previous prime is 121213201. The next prime is 121213219. The reversal of 121213212 is 212312121.

It is a tau number, because it is divible by the number of its divisors (12).

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 = 121213191 and 121213200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121213219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5050539 + ... + 5050562.

It is an arithmetic number, because the mean of its divisors is an integer number (23569238).

Almost surely, 2^121213212 is an apocalyptic number.

121213212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121213212 is an abundant number, since it is smaller than the sum of its proper divisors (161617644).

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

121213212 is a wasteful number, since it uses less digits than its factorization.

121213212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10101108 (or 10101106 counting only the distinct ones).

The product of its digits is 48, while the sum is 15.

The square root of 121213212 is about 11009.6871890168. The cubic root of 121213212 is about 494.8990876833.

Adding to 121213212 its reverse (212312121), we get a palindrome (333525333).

The spelling of 121213212 in words is "one hundred twenty-one million, two hundred thirteen thousand, two hundred twelve".