1220305121 has 8 divisors (see below), whose sum is σ = 1397142720. Its totient is φ = 1044094608.

The previous prime is 1220305109. The next prime is 1220305159. The reversal of 1220305121 is 1215030221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1220305121 - 2⁶ = 1220305057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220305121.

It is not an unprimeable number, because it can be changed into a prime (1220305171) 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, 152591 + ... + 160388.

It is an arithmetic number, because the mean of its divisors is an integer number (174642840).

Almost surely, 2^1220305121 is an apocalyptic number.

It is an amenable number.

1220305121 is a deficient number, since it is larger than the sum of its proper divisors (176837599).

1220305121 is an equidigital number, since it uses as much as digits as its factorization.

1220305121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313543.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 1220305121 is about 34932.8659144938. The cubic root of 1220305121 is about 1068.6188021936.

Adding to 1220305121 its reverse (1215030221), we get a palindrome (2435335342).

The spelling of 1220305121 in words is "one billion, two hundred twenty million, three hundred five thousand, one hundred twenty-one".