1244421221 has 2 divisors, whose sum is σ = 1244421222. Its totient is φ = 1244421220.

The previous prime is 1244421197. The next prime is 1244421257. The reversal of 1244421221 is 1221244421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1222900900 + 21520321 = 34970^2 + 4639^2 .

It is an emirp because it is prime and its reverse (1221244421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1244421221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1244424221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622210610 + 622210611.

It is an arithmetic number, because the mean of its divisors is an integer number (622210611).

Almost surely, 2^1244421221 is an apocalyptic number.

It is an amenable number.

1244421221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1244421221 is an equidigital number, since it uses as much as digits as its factorization.

1244421221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1024, while the sum is 23.

The square root of 1244421221 is about 35276.3549846069. The cubic root of 1244421221 is about 1075.6124063491.

Adding to 1244421221 its reverse (1221244421), we get a palindrome (2465665642).

The spelling of 1244421221 in words is "one billion, two hundred forty-four million, four hundred twenty-one thousand, two hundred twenty-one".