1244206121 has 4 divisors (see below), whose sum is σ = 1249369044. Its totient is φ = 1239043200.

The previous prime is 1244206063. The next prime is 1244206123. The reversal of 1244206121 is 1216024421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 411075625 + 833130496 = 20275^2 + 28864^2 .

It is a cyclic number.

It is not a de Polignac number, because 1244206121 - 2¹⁰ = 1244205097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1244206123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2581100 + ... + 2581581.

It is an arithmetic number, because the mean of its divisors is an integer number (312342261).

Almost surely, 2^1244206121 is an apocalyptic number.

It is an amenable number.

1244206121 is a deficient number, since it is larger than the sum of its proper divisors (5162923).

1244206121 is an equidigital number, since it uses as much as digits as its factorization.

1244206121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5162922.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 1244206121 is about 35273.3060684705. The cubic root of 1244206121 is about 1075.5504290602.

The spelling of 1244206121 in words is "one billion, two hundred forty-four million, two hundred six thousand, one hundred twenty-one".