121213206 has 16 divisors (see below), whose sum is σ = 269362800. Its totient is φ = 40404384.

The previous prime is 121213201. The next prime is 121213219. The reversal of 121213206 is 602312121.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121213201) 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 7 ways as a sum of consecutive naturals, for example, 1122291 + ... + 1122398.

It is an arithmetic number, because the mean of its divisors is an integer number (16835175).

Almost surely, 2^121213206 is an apocalyptic number.

121213206 is an abundant number, since it is smaller than the sum of its proper divisors (148149594).

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

121213206 is a wasteful number, since it uses less digits than its factorization.

121213206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2244700 (or 2244694 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 121213206 is about 11009.6869165295. The cubic root of 121213206 is about 494.8990795176.

Adding to 121213206 its reverse (602312121), we get a palindrome (723525327).

The spelling of 121213206 in words is "one hundred twenty-one million, two hundred thirteen thousand, two hundred six".