1244042221 has 4 divisors (see below), whose sum is σ = 1249381692. Its totient is φ = 1238702752.

The previous prime is 1244042209. The next prime is 1244042257. The reversal of 1244042221 is 1222404421.

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 511257321 + 732784900 = 22611^2 + 27070^2 .

It is a cyclic number.

It is not a de Polignac number, because 1244042221 - 2²¹ = 1241945069 is a prime.

It is a super-2 number, since 2×1244042221² = 3095282095261225682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1244042192 and 1244042201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244042021) 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, 2669386 + ... + 2669851.

It is an arithmetic number, because the mean of its divisors is an integer number (312345423).

Almost surely, 2^1244042221 is an apocalyptic number.

It is an amenable number.

1244042221 is a deficient number, since it is larger than the sum of its proper divisors (5339471).

1244042221 is an equidigital number, since it uses as much as digits as its factorization.

1244042221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5339470.

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 1244042221 is about 35270.9827053344. The cubic root of 1244042221 is about 1075.5031993572.

Adding to 1244042221 its reverse (1222404421), we get a palindrome (2466446642).

The spelling of 1244042221 in words is "one billion, two hundred forty-four million, forty-two thousand, two hundred twenty-one".