11213221031 has 2 divisors, whose sum is σ = 11213221032. Its totient is φ = 11213221030.

The previous prime is 11213221009. The next prime is 11213221039. The reversal of 11213221031 is 13012231211.

11213221031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11213221031 is a prime.

It is a super-2 number, since 2×11213221031² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11213221039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5606610515 + 5606610516.

It is an arithmetic number, because the mean of its divisors is an integer number (5606610516).

Almost surely, 2^11213221031 is an apocalyptic number.

11213221031 is a deficient number, since it is larger than the sum of its proper divisors (1).

11213221031 is an equidigital number, since it uses as much as digits as its factorization.

11213221031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 11213221031 its reverse (13012231211), we get a palindrome (24225452242).

The spelling of 11213221031 in words is "eleven billion, two hundred thirteen million, two hundred twenty-one thousand, thirty-one".