1121021120221 has 2 divisors, whose sum is σ = 1121021120222. Its totient is φ = 1121021120220.

The previous prime is 1121021120209. The next prime is 1121021120293. The reversal of 1121021120221 is 1220211201211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1106411563321 + 14609556900 = 1051861^2 + 120870^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121021120221 - 2²⁹ = 1120484249309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1121021120195 and 1121021120204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121021120201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560510560110 + 560510560111.

It is an arithmetic number, because the mean of its divisors is an integer number (560510560111).

Almost surely, 2^{1121021120221} is an apocalyptic number.

It is an amenable number.

1121021120221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121021120221 is an equidigital number, since it uses as much as digits as its factorization.

1121021120221 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 16.

Adding to 1121021120221 its reverse (1220211201211), we get a palindrome (2341232321432).

The spelling of 1121021120221 in words is "one trillion, one hundred twenty-one billion, twenty-one million, one hundred twenty thousand, two hundred twenty-one".