123220023121 has 4 divisors (see below), whose sum is σ = 132698486452. Its totient is φ = 113741559792.

The previous prime is 123220023089. The next prime is 123220023127. The reversal of 123220023121 is 121320022321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121320022321 = 859 ⋅141234019.

It can be written as a sum of positive squares in 2 ways, for example, as 47506997521 + 75713025600 = 217961^2 + 275160^2 .

It is a cyclic number.

It is not a de Polignac number, because 123220023121 - 2⁵ = 123220023089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123220023127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4739231646 + ... + 4739231671.

It is an arithmetic number, because the mean of its divisors is an integer number (33174621613).

Almost surely, 2^123220023121 is an apocalyptic number.

It is an amenable number.

123220023121 is a deficient number, since it is larger than the sum of its proper divisors (9478463331).

123220023121 is an equidigital number, since it uses as much as digits as its factorization.

123220023121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9478463330.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 123220023121 its reverse (121320022321), we get a palindrome (244540045442).

The spelling of 123220023121 in words is "one hundred twenty-three billion, two hundred twenty million, twenty-three thousand, one hundred twenty-one".