123221112101 has 4 divisors (see below), whose sum is σ = 123221886732. Its totient is φ = 123220337472.

The previous prime is 123221112097. The next prime is 123221112107. The reversal of 123221112101 is 101211122321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 24231592225 + 98989519876 = 155665^2 + 314626^2 .

It is a cyclic number.

It is not a de Polignac number, because 123221112101 - 2² = 123221112097 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 123221112101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123221112107) 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, 51866 + ... + 499131.

It is an arithmetic number, because the mean of its divisors is an integer number (30805471683).

Almost surely, 2^123221112101 is an apocalyptic number.

It is an amenable number.

123221112101 is a deficient number, since it is larger than the sum of its proper divisors (774631).

123221112101 is an equidigital number, since it uses as much as digits as its factorization.

123221112101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774630.

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

Adding to 123221112101 its reverse (101211122321), we get a palindrome (224432234422).

The spelling of 123221112101 in words is "one hundred twenty-three billion, two hundred twenty-one million, one hundred twelve thousand, one hundred one".