1121222100221 has 2 divisors, whose sum is σ = 1121222100222. Its totient is φ = 1121222100220.

The previous prime is 1121222100217. The next prime is 1121222100233. The reversal of 1121222100221 is 1220012221211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1049405604025 + 71816496196 = 1024405^2 + 267986^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121222100221 - 2² = 1121222100217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1121222100221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121222100521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560611050110 + 560611050111.

It is an arithmetic number, because the mean of its divisors is an integer number (560611050111).

Almost surely, 2^{1121222100221} is an apocalyptic number.

It is an amenable number.

1121222100221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121222100221 is an equidigital number, since it uses as much as digits as its factorization.

1121222100221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1121222100221 its reverse (1220012221211), we get a palindrome (2341234321432).

The spelling of 1121222100221 in words is "one trillion, one hundred twenty-one billion, two hundred twenty-two million, one hundred thousand, two hundred twenty-one".