1242120001 has 2 divisors, whose sum is σ = 1242120002. Its totient is φ = 1242120000.

The previous prime is 1242119987. The next prime is 1242120023. The reversal of 1242120001 is 1000212421.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 999508225 + 242611776 = 31615^2 + 15576^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242120001 - 2¹⁹ = 1241595713 is a prime.

It is not a weakly prime, because it can be changed into another prime (1242120091) 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, 621060000 + 621060001.

It is an arithmetic number, because the mean of its divisors is an integer number (621060001).

Almost surely, 2^1242120001 is an apocalyptic number.

It is an amenable number.

1242120001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242120001 is an equidigital number, since it uses as much as digits as its factorization.

1242120001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1242120001 is about 35243.7228595391. The cubic root of 1242120001 is about 1074.9489792984.

Adding to 1242120001 its reverse (1000212421), we get a palindrome (2242332422).

The spelling of 1242120001 in words is "one billion, two hundred forty-two million, one hundred twenty thousand, one".