123221212111 has 8 divisors (see below), whose sum is σ = 124789457520. Its totient is φ = 121654958592.

The previous prime is 123221212109. The next prime is 123221212133. The reversal of 123221212111 is 111212122321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 123221212111 - 2¹ = 123221212109 is a prime.

It is a super-2 number, since 2×123221212111² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123221252111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 373266 + ... + 621103.

It is an arithmetic number, because the mean of its divisors is an integer number (15598682190).

Almost surely, 2^123221212111 is an apocalyptic number.

123221212111 is a deficient number, since it is larger than the sum of its proper divisors (1568245409).

123221212111 is an equidigital number, since it uses as much as digits as its factorization.

123221212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995945.

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

Adding to 123221212111 its reverse (111212122321), we get a palindrome (234433334432).

The spelling of 123221212111 in words is "one hundred twenty-three billion, two hundred twenty-one million, two hundred twelve thousand, one hundred eleven".