11202221081 has 2 divisors, whose sum is σ = 11202221082. Its totient is φ = 11202221080.

The previous prime is 11202221057. The next prime is 11202221083. The reversal of 11202221081 is 18012220211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5616153481 + 5586067600 = 74941^2 + 74740^2 .

It is an emirp because it is prime and its reverse (18012220211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11202221081 - 2¹⁴ = 11202204697 is a prime.

It is a super-2 number, since 2×11202221081² (a number of 21 digits) contains 22 as substring.

Together with 11202221083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11202221083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5601110540 + 5601110541.

It is an arithmetic number, because the mean of its divisors is an integer number (5601110541).

Almost surely, 2^11202221081 is an apocalyptic number.

It is an amenable number.

11202221081 is a deficient number, since it is larger than the sum of its proper divisors (1).

11202221081 is an equidigital number, since it uses as much as digits as its factorization.

11202221081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 11202221081 its reverse (18012220211), we get a palindrome (29214441292).

The spelling of 11202221081 in words is "eleven billion, two hundred two million, two hundred twenty-one thousand, eighty-one".