1221324055 has 16 divisors (see below), whose sum is σ = 1713913344. Its totient is φ = 818002080.

The previous prime is 1221323927. The next prime is 1221324079. The reversal of 1221324055 is 5504231221.

It is not a de Polignac number, because 1221324055 - 2⁷ = 1221323927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 404251 + ... + 407260.

It is an arithmetic number, because the mean of its divisors is an integer number (107119584).

Almost surely, 2^1221324055 is an apocalyptic number.

1221324055 is a deficient number, since it is larger than the sum of its proper divisors (492589289).

1221324055 is an equidigital number, since it uses as much as digits as its factorization.

1221324055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811566.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1221324055 is about 34947.4470455282. The cubic root of 1221324055 is about 1068.9161456188.

Adding to 1221324055 its reverse (5504231221), we get a palindrome (6725555276).

The spelling of 1221324055 in words is "one billion, two hundred twenty-one million, three hundred twenty-four thousand, fifty-five".