1220333221 has 4 divisors (see below), whose sum is σ = 1229942272. Its totient is φ = 1210724172.

The previous prime is 1220333209. The next prime is 1220333237. The reversal of 1220333221 is 1223330221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220333221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220333281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4804335 + ... + 4804588.

It is an arithmetic number, because the mean of its divisors is an integer number (307485568).

Almost surely, 2^1220333221 is an apocalyptic number.

It is an amenable number.

1220333221 is a deficient number, since it is larger than the sum of its proper divisors (9609051).

1220333221 is an equidigital number, since it uses as much as digits as its factorization.

1220333221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9609050.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1220333221 is about 34933.2681122165. The cubic root of 1220333221 is about 1068.6270045022.

Adding to 1220333221 its reverse (1223330221), we get a palindrome (2443663442).

The spelling of 1220333221 in words is "one billion, two hundred twenty million, three hundred thirty-three thousand, two hundred twenty-one".