1220112221 has 2 divisors, whose sum is σ = 1220112222. Its totient is φ = 1220112220.

The previous prime is 1220112203. The next prime is 1220112233. The reversal of 1220112221 is 1222110221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1123188196 + 96924025 = 33514^2 + 9845^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220112221 - 2¹⁴ = 1220095837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220112196 and 1220112205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220112281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610056110 + 610056111.

It is an arithmetic number, because the mean of its divisors is an integer number (610056111).

Almost surely, 2^1220112221 is an apocalyptic number.

It is an amenable number.

1220112221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220112221 is an equidigital number, since it uses as much as digits as its factorization.

1220112221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1220112221 is about 34930.1047951477. The cubic root of 1220112221 is about 1068.5624918424.

Adding to 1220112221 its reverse (1222110221), we get a palindrome (2442222442).

The spelling of 1220112221 in words is "one billion, two hundred twenty million, one hundred twelve thousand, two hundred twenty-one".