123401111221 has 4 divisors (see below), whose sum is σ = 123401890444. Its totient is φ = 123400332000.

The previous prime is 123401111203. The next prime is 123401111311. The reversal of 123401111221 is 122111104321.

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, and also an emirpimes, since its reverse is a distinct semiprime: 122111104321 = 290317 ⋅420613.

It can be written as a sum of positive squares in 2 ways, for example, as 35124382225 + 88276728996 = 187415^2 + 297114^2 .

It is a cyclic number.

It is not a de Polignac number, because 123401111221 - 2⁵ = 123401111189 is a prime.

It is a super-2 number, since 2×123401111221² (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 (123401111621) 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, 57960 + ... + 500161.

It is an arithmetic number, because the mean of its divisors is an integer number (30850472611).

Almost surely, 2^123401111221 is an apocalyptic number.

It is an amenable number.

123401111221 is a deficient number, since it is larger than the sum of its proper divisors (779223).

123401111221 is an equidigital number, since it uses as much as digits as its factorization.

123401111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779222.

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

Adding to 123401111221 its reverse (122111104321), we get a palindrome (245512215542).

The spelling of 123401111221 in words is "one hundred twenty-three billion, four hundred one million, one hundred eleven thousand, two hundred twenty-one".