1220013221 has 12 divisors (see below), whose sum is σ = 1420011360. Its totient is φ = 1045127160.

The previous prime is 1220013217. The next prime is 1220013229. The reversal of 1220013221 is 1223100221.

It is a happy number.

It is not a de Polignac number, because 1220013221 - 2² = 1220013217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220013196 and 1220013205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220013229) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 93806 + ... + 106016.

It is an arithmetic number, because the mean of its divisors is an integer number (118334280).

Almost surely, 2^1220013221 is an apocalyptic number.

It is an amenable number.

1220013221 is a deficient number, since it is larger than the sum of its proper divisors (199998139).

1220013221 is a wasteful number, since it uses less digits than its factorization.

1220013221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14264 (or 14257 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1220013221 is about 34928.6876506977. The cubic root of 1220013221 is about 1068.5335899796.

Adding to 1220013221 its reverse (1223100221), we get a palindrome (2443113442).

The spelling of 1220013221 in words is "one billion, two hundred twenty million, thirteen thousand, two hundred twenty-one".