1131222120221 has 2 divisors, whose sum is σ = 1131222120222. Its totient is φ = 1131222120220.

The previous prime is 1131222120211. The next prime is 1131222120241. The reversal of 1131222120221 is 1220212221311.

It is an a-pointer prime, because the next prime (1131222120241) can be obtained adding 1131222120221 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 859978022500 + 271244097721 = 927350^2 + 520811^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131222120221 - 2⁶ = 1131222120157 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1131222120193 and 1131222120202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131222120211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565611060110 + 565611060111.

It is an arithmetic number, because the mean of its divisors is an integer number (565611060111).

Almost surely, 2^{1131222120221} is an apocalyptic number.

It is an amenable number.

1131222120221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131222120221 is an equidigital number, since it uses as much as digits as its factorization.

1131222120221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 1131222120221 its reverse (1220212221311), we get a palindrome (2351434341532).

The spelling of 1131222120221 in words is "one trillion, one hundred thirty-one billion, two hundred twenty-two million, one hundred twenty thousand, two hundred twenty-one".