123442241221 has 4 divisors (see below), whose sum is σ = 132937798252. Its totient is φ = 113946684192.

The previous prime is 123442241179. The next prime is 123442241249. The reversal of 123442241221 is 122142244321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122142244321 = 113 ⋅1080904817.

It can be written as a sum of positive squares in 2 ways, for example, as 45182178721 + 78260062500 = 212561^2 + 279750^2 .

It is a cyclic number.

It is not a de Polignac number, because 123442241221 - 2¹³ = 123442233029 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 123442241221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123442241281) 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, 4747778496 + ... + 4747778521.

It is an arithmetic number, because the mean of its divisors is an integer number (33234449563).

Almost surely, 2^123442241221 is an apocalyptic number.

It is an amenable number.

123442241221 is a deficient number, since it is larger than the sum of its proper divisors (9495557031).

123442241221 is an equidigital number, since it uses as much as digits as its factorization.

123442241221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9495557030.

The product of its digits is 6144, while the sum is 28.

Adding to 123442241221 its reverse (122142244321), we get a palindrome (245584485542).

The spelling of 123442241221 in words is "one hundred twenty-three billion, four hundred forty-two million, two hundred forty-one thousand, two hundred twenty-one".