1121221102021 has 2 divisors, whose sum is σ = 1121221102022. Its totient is φ = 1121221102020.

The previous prime is 1121221102003. The next prime is 1121221102097. The reversal of 1121221102021 is 1202011221211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 690735521025 + 430485580996 = 831105^2 + 656114^2 .

It is an emirp because it is prime and its reverse (1202011221211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1121221102021 - 2⁵ = 1121221101989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1121221101986 and 1121221102004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121221102121) 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, 560610551010 + 560610551011.

It is an arithmetic number, because the mean of its divisors is an integer number (560610551011).

Almost surely, 2^{1121221102021} is an apocalyptic number.

It is an amenable number.

1121221102021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121221102021 is an equidigital number, since it uses as much as digits as its factorization.

1121221102021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1121221102021 its reverse (1202011221211), we get a palindrome (2323232323232).

The spelling of 1121221102021 in words is "one trillion, one hundred twenty-one billion, two hundred twenty-one million, one hundred two thousand, twenty-one".