1242103125221 has 16 divisors (see below), whose sum is σ = 1468553120640. Its totient is φ = 1027907643840.

The previous prime is 1242103125217. The next prime is 1242103125227. The reversal of 1242103125221 is 1225213012421.

It is not a de Polignac number, because 1242103125221 - 2² = 1242103125217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242103125227) 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 15 ways as a sum of consecutive naturals, for example, 5891195 + ... + 6098391.

It is an arithmetic number, because the mean of its divisors is an integer number (91784570040).

Almost surely, 2^{1242103125221} is an apocalyptic number.

It is an amenable number.

1242103125221 is a deficient number, since it is larger than the sum of its proper divisors (226449995419).

1242103125221 is a wasteful number, since it uses less digits than its factorization.

1242103125221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236764.

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

Adding to 1242103125221 its reverse (1225213012421), we get a palindrome (2467316137642).

The spelling of 1242103125221 in words is "one trillion, two hundred forty-two billion, one hundred three million, one hundred twenty-five thousand, two hundred twenty-one".