1242121201 has 4 divisors (see below), whose sum is σ = 1315187172. Its totient is φ = 1169055232.

The previous prime is 1242121189. The next prime is 1242121211. The reversal of 1242121201 is 1021212421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1021212421 = 6679 ⋅152899.

It can be written as a sum of positive squares in 2 ways, for example, as 355511025 + 886610176 = 18855^2 + 29776^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242121201 - 2⁹ = 1242120689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242121211) 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, 36532960 + ... + 36532993.

It is an arithmetic number, because the mean of its divisors is an integer number (328796793).

Almost surely, 2^1242121201 is an apocalyptic number.

It is an amenable number.

1242121201 is a deficient number, since it is larger than the sum of its proper divisors (73065971).

1242121201 is an equidigital number, since it uses as much as digits as its factorization.

1242121201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73065970.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1242121201 is about 35243.7398838432. The cubic root of 1242121201 is about 1074.9493254642.

Adding to 1242121201 its reverse (1021212421), we get a palindrome (2263333622).

The spelling of 1242121201 in words is "one billion, two hundred forty-two million, one hundred twenty-one thousand, two hundred one".