1221334347 has 4 divisors (see below), whose sum is σ = 1628445800. Its totient is φ = 814222896.

The previous prime is 1221334343. The next prime is 1221334351. The reversal of 1221334347 is 7434331221.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1221334343) and next prime (1221334351).

It is not a de Polignac number, because 1221334347 - 2² = 1221334343 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221334343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203555722 + ... + 203555727.

It is an arithmetic number, because the mean of its divisors is an integer number (407111450).

Almost surely, 2^1221334347 is an apocalyptic number.

1221334347 is a deficient number, since it is larger than the sum of its proper divisors (407111453).

1221334347 is an equidigital number, since it uses as much as digits as its factorization.

1221334347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407111452.

The product of its digits is 12096, while the sum is 30.

The square root of 1221334347 is about 34947.5942948867. The cubic root of 1221334347 is about 1068.9191481673.

Adding to 1221334347 its reverse (7434331221), we get a palindrome (8655665568).

The spelling of 1221334347 in words is "one billion, two hundred twenty-one million, three hundred thirty-four thousand, three hundred forty-seven".