2120111221 has 2 divisors, whose sum is σ = 2120111222. Its totient is φ = 2120111220.

The previous prime is 2120111183. The next prime is 2120111233. The reversal of 2120111221 is 1221110212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2071251121 + 48860100 = 45511^2 + 6990^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120111221 - 2⁷ = 2120111093 is a prime.

It is a super-2 number, since 2×2120111221² = 8989743178820221682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120111291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060055610 + 1060055611.

It is an arithmetic number, because the mean of its divisors is an integer number (1060055611).

Almost surely, 2^2120111221 is an apocalyptic number.

It is an amenable number.

2120111221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120111221 is an equidigital number, since it uses as much as digits as its factorization.

2120111221 is an odious number, because the sum of its binary digits is odd.

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

The square root of 2120111221 is about 46044.6654999252. The cubic root of 2120111221 is about 1284.6541224167.

Adding to 2120111221 its reverse (1221110212), we get a palindrome (3341221433).

The spelling of 2120111221 in words is "two billion, one hundred twenty million, one hundred eleven thousand, two hundred twenty-one".