1220321225 has 12 divisors (see below), whose sum is σ = 1516658880. Its totient is φ = 974024400.

The previous prime is 1220321203. The next prime is 1220321261. The reversal of 1220321225 is 5221230221.

It is not a de Polignac number, because 1220321225 - 2²² = 1216126921 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220321197 and 1220321206.

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 11 ways as a sum of consecutive naturals, for example, 44621 + ... + 66570.

It is an arithmetic number, because the mean of its divisors is an integer number (126388240).

Almost surely, 2^1220321225 is an apocalyptic number.

It is an amenable number.

1220321225 is a deficient number, since it is larger than the sum of its proper divisors (296337655).

1220321225 is a wasteful number, since it uses less digits than its factorization.

1220321225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111640 (or 111635 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1220321225 is about 34933.0964130007. The cubic root of 1220321225 is about 1068.6235029200.

Adding to 1220321225 its reverse (5221230221), we get a palindrome (6441551446).

The spelling of 1220321225 in words is "one billion, two hundred twenty million, three hundred twenty-one thousand, two hundred twenty-five".