123124450121 has 4 divisors (see below), whose sum is σ = 130367064852. Its totient is φ = 115881835392.

The previous prime is 123124450109. The next prime is 123124450159. The reversal of 123124450121 is 121054421321.

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: 121054421321 = 17 ⋅7120848313.

It can be written as a sum of positive squares in 2 ways, for example, as 88247020096 + 34877430025 = 297064^2 + 186755^2 .

It is a cyclic number.

It is not a de Polignac number, because 123124450121 - 2²⁶ = 123057341257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123124450021) 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, 3621307340 + ... + 3621307373.

It is an arithmetic number, because the mean of its divisors is an integer number (32591766213).

Almost surely, 2^123124450121 is an apocalyptic number.

It is an amenable number.

123124450121 is a deficient number, since it is larger than the sum of its proper divisors (7242614731).

123124450121 is an equidigital number, since it uses as much as digits as its factorization.

123124450121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7242614730.

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 123124450121 its reverse (121054421321), we get a palindrome (244178871442).

The spelling of 123124450121 in words is "one hundred twenty-three billion, one hundred twenty-four million, four hundred fifty thousand, one hundred twenty-one".