121443213 has 32 divisors (see below), whose sum is σ = 177730560. Its totient is φ = 73543680.

The previous prime is 121443209. The next prime is 121443227. The reversal of 121443213 is 312344121.

It is not a de Polignac number, because 121443213 - 2² = 121443209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121443213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121443233) 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, 99181 + ... + 100397.

It is an arithmetic number, because the mean of its divisors is an integer number (5554080).

Almost surely, 2^121443213 is an apocalyptic number.

It is an amenable number.

121443213 is a deficient number, since it is larger than the sum of its proper divisors (56287347).

121443213 is a wasteful number, since it uses less digits than its factorization.

121443213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1317.

The product of its digits is 576, while the sum is 21.

The square root of 121443213 is about 11020.1276308399. The cubic root of 121443213 is about 495.2119121232.

Adding to 121443213 its reverse (312344121), we get a palindrome (433787334).

The spelling of 121443213 in words is "one hundred twenty-one million, four hundred forty-three thousand, two hundred thirteen".