1220232221 has 12 divisors (see below), whose sum is σ = 1325542932. Its totient is φ = 1122765696.

The previous prime is 1220232203. The next prime is 1220232241. The reversal of 1220232221 is 1222320221.

It can be written as a sum of positive squares in 6 ways, for example, as 212868100 + 1007364121 = 14590^2 + 31739^2 .

It is not a de Polignac number, because 1220232221 - 2¹⁴ = 1220215837 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 1220232221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220232241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42185 + ... + 64961.

It is an arithmetic number, because the mean of its divisors is an integer number (110461911).

Almost surely, 2^1220232221 is an apocalyptic number.

It is an amenable number.

1220232221 is a deficient number, since it is larger than the sum of its proper divisors (105310711).

1220232221 is a wasteful number, since it uses less digits than its factorization.

1220232221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23120 (or 23107 counting only the distinct ones).

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

The square root of 1220232221 is about 34931.8224689179. The cubic root of 1220232221 is about 1068.5975223074.

Adding to 1220232221 its reverse (1222320221), we get a palindrome (2442552442).

The spelling of 1220232221 in words is "one billion, two hundred twenty million, two hundred thirty-two thousand, two hundred twenty-one".