1221341463 has 8 divisors (see below), whose sum is σ = 1809394800. Its totient is φ = 814227624.

The previous prime is 1221341449. The next prime is 1221341479. The reversal of 1221341463 is 3641431221.

It is a happy number.

It is not a de Polignac number, because 1221341463 - 2⁴ = 1221341447 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 45234869 = 1221341463 / (1 + 2 + 2 + 1 + 3 + 4 + 1 + 4 + 6 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221341663) 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 7 ways as a sum of consecutive naturals, for example, 22617408 + ... + 22617461.

It is an arithmetic number, because the mean of its divisors is an integer number (226174350).

Almost surely, 2^1221341463 is an apocalyptic number.

1221341463 is a deficient number, since it is larger than the sum of its proper divisors (588053337).

1221341463 is an equidigital number, since it uses as much as digits as its factorization.

1221341463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45234878 (or 45234872 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 1221341463 is about 34947.6961043214. The cubic root of 1221341463 is about 1068.9212241519.

Adding to 1221341463 its reverse (3641431221), we get a palindrome (4862772684).

The spelling of 1221341463 in words is "one billion, two hundred twenty-one million, three hundred forty-one thousand, four hundred sixty-three".