1244223312221 has 2 divisors, whose sum is σ = 1244223312222. Its totient is φ = 1244223312220.

The previous prime is 1244223312193. The next prime is 1244223312247. The reversal of 1244223312221 is 1222133224421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 814300492996 + 429922819225 = 902386^2 + 655685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1244223312221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1244223312121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622111656110 + 622111656111.

It is an arithmetic number, because the mean of its divisors is an integer number (622111656111).

Almost surely, 2^{1244223312221} is an apocalyptic number.

It is an amenable number.

1244223312221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1244223312221 is an equidigital number, since it uses as much as digits as its factorization.

1244223312221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 29.

Adding to 1244223312221 its reverse (1222133224421), we get a palindrome (2466356536642).

The spelling of 1244223312221 in words is "one trillion, two hundred forty-four billion, two hundred twenty-three million, three hundred twelve thousand, two hundred twenty-one".