311221121011 has 2 divisors, whose sum is σ = 311221121012. Its totient is φ = 311221121010.

The previous prime is 311221120961. The next prime is 311221121021. The reversal of 311221121011 is 110121122113.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 311221121011 - 2⁷ = 311221120883 is a prime.

It is a super-3 number, since 3×311221121011³ (a number of 35 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (311221121021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155610560505 + 155610560506.

It is an arithmetic number, because the mean of its divisors is an integer number (155610560506).

Almost surely, 2^311221121011 is an apocalyptic number.

311221121011 is a deficient number, since it is larger than the sum of its proper divisors (1).

311221121011 is an equidigital number, since it uses as much as digits as its factorization.

311221121011 is an odious number, because the sum of its binary digits is odd.

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

Adding to 311221121011 its reverse (110121122113), we get a palindrome (421342243124).

The spelling of 311221121011 in words is "three hundred eleven billion, two hundred twenty-one million, one hundred twenty-one thousand, eleven".