1242125102 has 4 divisors (see below), whose sum is σ = 1863187656. Its totient is φ = 621062550.

The previous prime is 1242125099. The next prime is 1242125107. The reversal of 1242125102 is 2015212421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2015212421 = 223 ⋅9036827.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242125107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310531274 + ... + 310531277.

It is an arithmetic number, because the mean of its divisors is an integer number (465796914).

Almost surely, 2^1242125102 is an apocalyptic number.

1242125102 is a deficient number, since it is larger than the sum of its proper divisors (621062554).

1242125102 is an equidigital number, since it uses as much as digits as its factorization.

1242125102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621062553.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1242125102 is about 35243.7952269616. The cubic root of 1242125102 is about 1074.9504507899.

Adding to 1242125102 its reverse (2015212421), we get a palindrome (3257337523).

The spelling of 1242125102 in words is "one billion, two hundred forty-two million, one hundred twenty-five thousand, one hundred two".