1345442221 has 2 divisors, whose sum is σ = 1345442222. Its totient is φ = 1345442220.

The previous prime is 1345442207. The next prime is 1345442233. The reversal of 1345442221 is 1222445431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 893412100 + 452030121 = 29890^2 + 21261^2 .

It is a cyclic number.

It is not a de Polignac number, because 1345442221 - 2⁹ = 1345441709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1345442221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1345442321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 672721110 + 672721111.

It is an arithmetic number, because the mean of its divisors is an integer number (672721111).

Almost surely, 2^1345442221 is an apocalyptic number.

It is an amenable number.

1345442221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1345442221 is an equidigital number, since it uses as much as digits as its factorization.

1345442221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7680, while the sum is 28.

The square root of 1345442221 is about 36680.2701871183. The cubic root of 1345442221 is about 1103.9642693597.

Adding to 1345442221 its reverse (1222445431), we get a palindrome (2567887652).

The spelling of 1345442221 in words is "one billion, three hundred forty-five million, four hundred forty-two thousand, two hundred twenty-one".