11121221131 has 2 divisors, whose sum is σ = 11121221132. Its totient is φ = 11121221130.

The previous prime is 11121221101. The next prime is 11121221141. The reversal of 11121221131 is 13112212111.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (13112212111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11121221131 - 2⁷ = 11121221003 is a prime.

It is a super-2 number, since 2×11121221131² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11121221101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5560610565 + 5560610566.

It is an arithmetic number, because the mean of its divisors is an integer number (5560610566).

Almost surely, 2^11121221131 is an apocalyptic number.

11121221131 is a deficient number, since it is larger than the sum of its proper divisors (1).

11121221131 is an equidigital number, since it uses as much as digits as its factorization.

11121221131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24, while the sum is 16.

Adding to 11121221131 its reverse (13112212111), we get a palindrome (24233433242).

The spelling of 11121221131 in words is "eleven billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred thirty-one".