11220112021 has 2 divisors, whose sum is σ = 11220112022. Its totient is φ = 11220112020.

The previous prime is 11220111997. The next prime is 11220112073. The reversal of 11220112021 is 12021102211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8308322500 + 2911789521 = 91150^2 + 53961^2 .

It is a cyclic number.

It is not a de Polignac number, because 11220112021 - 2²¹ = 11218014869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11220111992 and 11220112010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11220112091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5610056010 + 5610056011.

It is an arithmetic number, because the mean of its divisors is an integer number (5610056011).

Almost surely, 2^11220112021 is an apocalyptic number.

It is an amenable number.

11220112021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11220112021 is an equidigital number, since it uses as much as digits as its factorization.

11220112021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 11220112021 its reverse (12021102211), we get a palindrome (23241214232).

The spelling of 11220112021 in words is "eleven billion, two hundred twenty million, one hundred twelve thousand, twenty-one".