1220302221 has 4 divisors (see below), whose sum is σ = 1627069632. Its totient is φ = 813534812.

The previous prime is 1220302207. The next prime is 1220302231. The reversal of 1220302221 is 1222030221.

It is a happy number.

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 not a de Polignac number, because 1220302221 - 2²² = 1216107917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220302221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220302201) 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, 203383701 + ... + 203383706.

It is an arithmetic number, because the mean of its divisors is an integer number (406767408).

Almost surely, 2^1220302221 is an apocalyptic number.

It is an amenable number.

1220302221 is a deficient number, since it is larger than the sum of its proper divisors (406767411).

1220302221 is an equidigital number, since it uses as much as digits as its factorization.

1220302221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406767410.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1220302221 is about 34932.8244062801. The cubic root of 1220302221 is about 1068.6179556848.

Adding to 1220302221 its reverse (1222030221), we get a palindrome (2442332442).

Subtracting 1220302221 from its reverse (1222030221), we obtain a cube (1728000 = 120³).

It can be divided in two parts, 122030 and 2221, that added together give a triangular number (124251 = T₄₉₈).

The spelling of 1220302221 in words is "one billion, two hundred twenty million, three hundred two thousand, two hundred twenty-one".