123221210111 has 4 divisors (see below), whose sum is σ = 123223587312. Its totient is φ = 123218832912.

The previous prime is 123221210069. The next prime is 123221210141. The reversal of 123221210111 is 111012122321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111012122321 = 751 ⋅147819071.

It is a cyclic number.

It is not a de Polignac number, because 123221210111 - 2²² = 123217015807 is a prime.

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 123221210111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123221210141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1109075 + ... + 1215108.

It is an arithmetic number, because the mean of its divisors is an integer number (30805896828).

Almost surely, 2^123221210111 is an apocalyptic number.

123221210111 is a deficient number, since it is larger than the sum of its proper divisors (2377201).

123221210111 is an equidigital number, since it uses as much as digits as its factorization.

123221210111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2377200.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 123221210111 its reverse (111012122321), we get a palindrome (234233332432).

The spelling of 123221210111 in words is "one hundred twenty-three billion, two hundred twenty-one million, two hundred ten thousand, one hundred eleven".