11121112021 has 2 divisors, whose sum is σ = 11121112022. Its totient is φ = 11121112020.

The previous prime is 11121111979. The next prime is 11121112027. The reversal of 11121112021 is 12021112111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10944088996 + 177023025 = 104614^2 + 13305^2 .

It is a cyclic number.

It is not a de Polignac number, because 11121112021 - 2²⁵ = 11087557589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11121111992 and 11121112010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11121112027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5560556010 + 5560556011.

It is an arithmetic number, because the mean of its divisors is an integer number (5560556011).

Almost surely, 2^11121112021 is an apocalyptic number.

It is an amenable number.

11121112021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11121112021 is an equidigital number, since it uses as much as digits as its factorization.

11121112021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11121112021 its reverse (12021112111), we get a palindrome (23142224132).

The spelling of 11121112021 in words is "eleven billion, one hundred twenty-one million, one hundred twelve thousand, twenty-one".