1242204121 has 2 divisors, whose sum is σ = 1242204122. Its totient is φ = 1242204120.

The previous prime is 1242204107. The next prime is 1242204157. The reversal of 1242204121 is 1214022421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1241505225 + 698896 = 35235^2 + 836^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242204121 is a prime.

It is not a weakly prime, because it can be changed into another prime (1242204181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621102060 + 621102061.

It is an arithmetic number, because the mean of its divisors is an integer number (621102061).

Almost surely, 2^1242204121 is an apocalyptic number.

It is an amenable number.

1242204121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242204121 is an equidigital number, since it uses as much as digits as its factorization.

1242204121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 1242204121 is about 35244.9162433393. The cubic root of 1242204121 is about 1074.9732449804.

Adding to 1242204121 its reverse (1214022421), we get a palindrome (2456226542).

The spelling of 1242204121 in words is "one billion, two hundred forty-two million, two hundred four thousand, one hundred twenty-one".