11120021221 has 2 divisors, whose sum is σ = 11120021222. Its totient is φ = 11120021220.

The previous prime is 11120021219. The next prime is 11120021233. The reversal of 11120021221 is 12212002111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8814580996 + 2305440225 = 93886^2 + 48015^2 .

It is a cyclic number.

It is not a de Polignac number, because 11120021221 - 2¹ = 11120021219 is a prime.

Together with 11120021219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11120021201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5560010610 + 5560010611.

It is an arithmetic number, because the mean of its divisors is an integer number (5560010611).

Almost surely, 2^11120021221 is an apocalyptic number.

It is an amenable number.

11120021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11120021221 is an equidigital number, since it uses as much as digits as its factorization.

11120021221 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 11120021221 its reverse (12212002111), we get a palindrome (23332023332).

The spelling of 11120021221 in words is "eleven billion, one hundred twenty million, twenty-one thousand, two hundred twenty-one".