1242103125205 has 16 divisors (see below), whose sum is σ = 1592389874880. Its totient is φ = 927332917632.

The previous prime is 1242103125143. The next prime is 1242103125217. The reversal of 1242103125205 is 5025213012421.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1242103125205 - 2³¹ = 1239955641557 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 97566544 + ... + 97579273.

It is an arithmetic number, because the mean of its divisors is an integer number (99524367180).

Almost surely, 2^{1242103125205} is an apocalyptic number.

It is an amenable number.

1242103125205 is a deficient number, since it is larger than the sum of its proper divisors (350286749675).

1242103125205 is a wasteful number, since it uses less digits than its factorization.

1242103125205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195145908.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 1242103125205 its reverse (5025213012421), we get a palindrome (6267316137626).

The spelling of 1242103125205 in words is "one trillion, two hundred forty-two billion, one hundred three million, one hundred twenty-five thousand, two hundred five".