1000120112221 has 2 divisors, whose sum is σ = 1000120112222. Its totient is φ = 1000120112220.

The previous prime is 1000120112213. The next prime is 1000120112227. The reversal of 1000120112221 is 1222110210001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 923424902500 + 76695209721 = 960950^2 + 276939^2 .

It is an emirp because it is prime and its reverse (1222110210001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1000120112221 - 2³ = 1000120112213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000120112227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500060056110 + 500060056111.

It is an arithmetic number, because the mean of its divisors is an integer number (500060056111).

Almost surely, 2^{1000120112221} is an apocalyptic number.

It is an amenable number.

1000120112221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000120112221 is an equidigital number, since it uses as much as digits as its factorization.

1000120112221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1000120112221 its reverse (1222110210001), we get a palindrome (2222230322222).

The spelling of 1000120112221 in words is "one trillion, one hundred twenty million, one hundred twelve thousand, two hundred twenty-one".