121220213223 has 16 divisors (see below), whose sum is σ = 167546620800. Its totient is φ = 77894466336.

The previous prime is 121220213207. The next prime is 121220213227. The reversal of 121220213223 is 322312022121.

It is not a de Polignac number, because 121220213223 - 2⁴ = 121220213207 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121220213223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220213227) 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, 5091273 + ... + 5115026.

It is an arithmetic number, because the mean of its divisors is an integer number (10471663800).

Almost surely, 2^121220213223 is an apocalyptic number.

121220213223 is a deficient number, since it is larger than the sum of its proper divisors (46326407577).

121220213223 is a wasteful number, since it uses less digits than its factorization.

121220213223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10206446.

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

Adding to 121220213223 its reverse (322312022121), we get a palindrome (443532235344).

The spelling of 121220213223 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred thirteen thousand, two hundred twenty-three".