2220312221 has 8 divisors (see below), whose sum is σ = 2266410744. Its totient is φ = 2174526720.

The previous prime is 2220312173. The next prime is 2220312223. The reversal of 2220312221 is 1222130222.

It can be written as a sum of positive squares in 4 ways, for example, as 139948900 + 2080363321 = 11830^2 + 45611^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2220312221 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 2220312221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220312223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63896 + ... + 92321.

It is an arithmetic number, because the mean of its divisors is an integer number (283301343).

Almost surely, 2^2220312221 is an apocalyptic number.

It is an amenable number.

2220312221 is a deficient number, since it is larger than the sum of its proper divisors (46098523).

2220312221 is a wasteful number, since it uses less digits than its factorization.

2220312221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156511.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 2220312221 is about 47120.1891019126. The cubic root of 2220312221 is about 1304.5819031256.

Adding to 2220312221 its reverse (1222130222), we get a palindrome (3442442443).

The spelling of 2220312221 in words is "two billion, two hundred twenty million, three hundred twelve thousand, two hundred twenty-one".