121111212223 has 4 divisors (see below), whose sum is σ = 121133154208. Its totient is φ = 121089270240.

The previous prime is 121111212197. The next prime is 121111212281. The reversal of 121111212223 is 322212111121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 322212111121 = 43661 ⋅7379861.

It is a cyclic number.

It is not a de Polignac number, because 121111212223 - 2¹³ = 121111204031 is a prime.

It is a super-2 number, since 2×121111212223² (a number of 23 digits) contains 22 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 121111212223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121111212293) 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, 10962711 + ... + 10973752.

It is an arithmetic number, because the mean of its divisors is an integer number (30283288552).

Almost surely, 2^121111212223 is an apocalyptic number.

121111212223 is a deficient number, since it is larger than the sum of its proper divisors (21941985).

121111212223 is an equidigital number, since it uses as much as digits as its factorization.

121111212223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21941984.

The product of its digits is 96, while the sum is 19.

Adding to 121111212223 its reverse (322212111121), we get a palindrome (443323323344).

The spelling of 121111212223 in words is "one hundred twenty-one billion, one hundred eleven million, two hundred twelve thousand, two hundred twenty-three".