121213223 has 4 divisors (see below), whose sum is σ = 121355520. Its totient is φ = 121070928.

The previous prime is 121213219. The next prime is 121213229. The reversal of 121213223 is 322312121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 322312121 = 4013 ⋅80317.

It is a cyclic number.

It is not a de Polignac number, because 121213223 - 2² = 121213219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121213229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69863 + ... + 71576.

It is an arithmetic number, because the mean of its divisors is an integer number (30338880).

Almost surely, 2^121213223 is an apocalyptic number.

121213223 is a deficient number, since it is larger than the sum of its proper divisors (142297).

121213223 is an equidigital number, since it uses as much as digits as its factorization.

121213223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142296.

The product of its digits is 144, while the sum is 17.

The square root of 121213223 is about 11009.6876885768. The cubic root of 121213223 is about 494.8991026539.

Adding to 121213223 its reverse (322312121), we get a palindrome (443525344).

The spelling of 121213223 in words is "one hundred twenty-one million, two hundred thirteen thousand, two hundred twenty-three".