1255123221042 has 16 divisors (see below), whose sum is σ = 2511295466400. Its totient is φ = 418199569632.

The previous prime is 1255123221041. The next prime is 1255123221061. The reversal of 1255123221042 is 2401223215521.

It is not an unprimeable number, because it can be changed into a prime (1255123221041) 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 7 ways as a sum of consecutive naturals, for example, 43693792 + ... + 43722507.

It is an arithmetic number, because the mean of its divisors is an integer number (156955966650).

Almost surely, 2^{1255123221042} is an apocalyptic number.

1255123221042 is an abundant number, since it is smaller than the sum of its proper divisors (1256172245358).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1255123221042 is a wasteful number, since it uses less digits than its factorization.

1255123221042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87418697.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 1255123221042 its reverse (2401223215521), we get a palindrome (3656346436563).

The spelling of 1255123221042 in words is "one trillion, two hundred fifty-five billion, one hundred twenty-three million, two hundred twenty-one thousand, forty-two".