1221341447 has 2 divisors, whose sum is σ = 1221341448. Its totient is φ = 1221341446.

The previous prime is 1221341419. The next prime is 1221341449. The reversal of 1221341447 is 7441431221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221341447 - 2¹⁸ = 1221079303 is a prime.

Together with 1221341449, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221341449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610670723 + 610670724.

It is an arithmetic number, because the mean of its divisors is an integer number (610670724).

Almost surely, 2^1221341447 is an apocalyptic number.

1221341447 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221341447 is an equidigital number, since it uses as much as digits as its factorization.

1221341447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 29.

The square root of 1221341447 is about 34947.6958754079. The cubic root of 1221341447 is about 1068.9212194841.

Adding to 1221341447 its reverse (7441431221), we get a palindrome (8662772668).

The spelling of 1221341447 in words is "one billion, two hundred twenty-one million, three hundred forty-one thousand, four hundred forty-seven".