121312223111 has 4 divisors (see below), whose sum is σ = 121363005000. Its totient is φ = 121261441224.

The previous prime is 121312223077. The next prime is 121312223171. The reversal of 121312223111 is 111322213121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111322213121 = 7 ⋅15903173303.

It is a cyclic number.

It is not a de Polignac number, because 121312223111 - 2¹⁴ = 121312206727 is a prime.

It is a super-2 number, since 2×121312223111² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121312223171) 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, 25387361 + ... + 25392138.

It is an arithmetic number, because the mean of its divisors is an integer number (30340751250).

Almost surely, 2^121312223111 is an apocalyptic number.

121312223111 is a deficient number, since it is larger than the sum of its proper divisors (50781889).

121312223111 is an equidigital number, since it uses as much as digits as its factorization.

121312223111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50781888.

The product of its digits is 144, while the sum is 20.

Adding to 121312223111 its reverse (111322213121), we get a palindrome (232634436232).

The spelling of 121312223111 in words is "one hundred twenty-one billion, three hundred twelve million, two hundred twenty-three thousand, one hundred eleven".