2220031221 has 4 divisors (see below), whose sum is σ = 2960041632. Its totient is φ = 1480020812.

The previous prime is 2220031217. The next prime is 2220031237. The reversal of 2220031221 is 1221300222.

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 2220031221 - 2² = 2220031217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2220031221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220031271) 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 3 ways as a sum of consecutive naturals, for example, 370005201 + ... + 370005206.

It is an arithmetic number, because the mean of its divisors is an integer number (740010408).

Almost surely, 2^2220031221 is an apocalyptic number.

It is an amenable number.

2220031221 is a deficient number, since it is larger than the sum of its proper divisors (740010411).

2220031221 is an equidigital number, since it uses as much as digits as its factorization.

2220031221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740010410.

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

The square root of 2220031221 is about 47117.2072708050. The cubic root of 2220031221 is about 1304.5268653735.

Adding to 2220031221 its reverse (1221300222), we get a palindrome (3441331443).

The spelling of 2220031221 in words is "two billion, two hundred twenty million, thirty-one thousand, two hundred twenty-one".