1121112021221 has 2 divisors, whose sum is σ = 1121112021222. Its totient is φ = 1121112021220.

The previous prime is 1121112021209. The next prime is 1121112021277. The reversal of 1121112021221 is 1221202111211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1046385784900 + 74726236321 = 1022930^2 + 273361^2 .

It is an emirp because it is prime and its reverse (1221202111211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1121112021221 - 2⁶ = 1121112021157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1121112021221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121112011221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560556010610 + 560556010611.

It is an arithmetic number, because the mean of its divisors is an integer number (560556010611).

Almost surely, 2^{1121112021221} is an apocalyptic number.

It is an amenable number.

1121112021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121112021221 is an equidigital number, since it uses as much as digits as its factorization.

1121112021221 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 17.

Adding to 1121112021221 its reverse (1221202111211), we get a palindrome (2342314132432).

The spelling of 1121112021221 in words is "one trillion, one hundred twenty-one billion, one hundred twelve million, twenty-one thousand, two hundred twenty-one".