1242454121 has 4 divisors (see below), whose sum is σ = 1242565200. Its totient is φ = 1242343044.

The previous prime is 1242454067. The next prime is 1242454139. The reversal of 1242454121 is 1214542421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1214542421 = 1109 ⋅1095169.

It is a cyclic number.

It is not a de Polignac number, because 1242454121 - 2¹⁰ = 1242453097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242454021) 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 in 3 ways as a sum of consecutive naturals, for example, 36611 + ... + 61848.

It is an arithmetic number, because the mean of its divisors is an integer number (310641300).

Almost surely, 2^1242454121 is an apocalyptic number.

It is an amenable number.

1242454121 is a deficient number, since it is larger than the sum of its proper divisors (111079).

1242454121 is an equidigital number, since it uses as much as digits as its factorization.

1242454121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111078.

The product of its digits is 2560, while the sum is 26.

The square root of 1242454121 is about 35248.4626756969. The cubic root of 1242454121 is about 1075.0453547837.

Adding to 1242454121 its reverse (1214542421), we get a palindrome (2456996542).

The spelling of 1242454121 in words is "one billion, two hundred forty-two million, four hundred fifty-four thousand, one hundred twenty-one".