123222121111 has 4 divisors (see below), whose sum is σ = 127471159800. Its totient is φ = 118973082424.

The previous prime is 123222121097. The next prime is 123222121177. The reversal of 123222121111 is 111121222321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123222121111 - 2¹¹ = 123222119063 is a prime.

It is a super-2 number, since 2×123222121111² (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 (123222421111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2124519301 + ... + 2124519358.

It is an arithmetic number, because the mean of its divisors is an integer number (31867789950).

Almost surely, 2^123222121111 is an apocalyptic number.

123222121111 is a deficient number, since it is larger than the sum of its proper divisors (4249038689).

123222121111 is an equidigital number, since it uses as much as digits as its factorization.

123222121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4249038688.

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

Adding to 123222121111 its reverse (111121222321), we get a palindrome (234343343432).

The spelling of 123222121111 in words is "one hundred twenty-three billion, two hundred twenty-two million, one hundred twenty-one thousand, one hundred eleven".