1244012221 has 4 divisors (see below), whose sum is σ = 1248602944. Its totient is φ = 1239421500.

The previous prime is 1244012219. The next prime is 1244012239. The reversal of 1244012221 is 1222104421.

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 an emirpimes, since its reverse is a distinct semiprime: 1222104421 = 179 ⋅6827399.

It is a cyclic number.

It is not a de Polignac number, because 1244012221 - 2¹ = 1244012219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244012321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2294955 + ... + 2295496.

It is an arithmetic number, because the mean of its divisors is an integer number (312150736).

Almost surely, 2^1244012221 is an apocalyptic number.

It is an amenable number.

1244012221 is a deficient number, since it is larger than the sum of its proper divisors (4590723).

1244012221 is an equidigital number, since it uses as much as digits as its factorization.

1244012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4590722.

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

The square root of 1244012221 is about 35270.5574240045. The cubic root of 1244012221 is about 1075.4945540571.

Adding to 1244012221 its reverse (1222104421), we get a palindrome (2466116642).

The spelling of 1244012221 in words is "one billion, two hundred forty-four million, twelve thousand, two hundred twenty-one".