1244031221 has 2 divisors, whose sum is σ = 1244031222. Its totient is φ = 1244031220.

The previous prime is 1244031197. The next prime is 1244031259. The reversal of 1244031221 is 1221304421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1031308996 + 212722225 = 32114^2 + 14585^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1244031221 is a prime.

It is a super-2 number, since 2×1244031221² = 3095227357645501682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1244031193 and 1244031202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1244034221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622015610 + 622015611.

It is an arithmetic number, because the mean of its divisors is an integer number (622015611).

Almost surely, 2^1244031221 is an apocalyptic number.

It is an amenable number.

1244031221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1244031221 is an equidigital number, since it uses as much as digits as its factorization.

1244031221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1244031221 is about 35270.8267694422. The cubic root of 1244031221 is about 1075.5000294300.

Adding to 1244031221 its reverse (1221304421), we get a palindrome (2465335642).

The spelling of 1244031221 in words is "one billion, two hundred forty-four million, thirty-one thousand, two hundred twenty-one".