121221122223 has 4 divisors (see below), whose sum is σ = 161628162968. Its totient is φ = 80814081480.

The previous prime is 121221122221. The next prime is 121221122237. The reversal of 121221122223 is 322221122121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 322221122121 = 3 ⋅107407040707.

It is not a de Polignac number, because 121221122223 - 2¹ = 121221122221 is a prime.

It is a super-3 number, since 3×121221122223³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121221122223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221122221) 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, 20203520368 + ... + 20203520373.

It is an arithmetic number, because the mean of its divisors is an integer number (40407040742).

Almost surely, 2^121221122223 is an apocalyptic number.

121221122223 is a deficient number, since it is larger than the sum of its proper divisors (40407040745).

121221122223 is an equidigital number, since it uses as much as digits as its factorization.

121221122223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40407040744.

The product of its digits is 384, while the sum is 21.

Adding to 121221122223 its reverse (322221122121), we get a palindrome (443442244344).

The spelling of 121221122223 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred twenty-two thousand, two hundred twenty-three".