123121140425 has 12 divisors (see below), whose sum is σ = 161650815516. Its totient is φ = 92702976000.

The previous prime is 123121140419. The next prime is 123121140427. The reversal of 123121140425 is 524041121321.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 8175053056 + 114946087369 = 90416^2 + 339037^2 .

It is not a de Polignac number, because 123121140425 - 2⁴ = 123121140409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123121140394 and 123121140403.

It is not an unprimeable number, because it can be changed into a prime (123121140427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 144847976 + ... + 144848825.

It is an arithmetic number, because the mean of its divisors is an integer number (13470901293).

Almost surely, 2^123121140425 is an apocalyptic number.

It is an amenable number.

123121140425 is a deficient number, since it is larger than the sum of its proper divisors (38529675091).

123121140425 is a wasteful number, since it uses less digits than its factorization.

123121140425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289696828 (or 289696823 counting only the distinct ones).

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

Adding to 123121140425 its reverse (524041121321), we get a palindrome (647162261746).

The spelling of 123121140425 in words is "one hundred twenty-three billion, one hundred twenty-one million, one hundred forty thousand, four hundred twenty-five".