111213220121 has 2 divisors, whose sum is σ = 111213220122. Its totient is φ = 111213220120.

The previous prime is 111213220117. The next prime is 111213220207. The reversal of 111213220121 is 121022312111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82096575625 + 29116644496 = 286525^2 + 170636^2 .

It is a cyclic number.

It is not a de Polignac number, because 111213220121 - 2² = 111213220117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111213220121.

It is not a weakly prime, because it can be changed into another prime (111213250121) 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, 55606610060 + 55606610061.

It is an arithmetic number, because the mean of its divisors is an integer number (55606610061).

Almost surely, 2^111213220121 is an apocalyptic number.

It is an amenable number.

111213220121 is a deficient number, since it is larger than the sum of its proper divisors (1).

111213220121 is an equidigital number, since it uses as much as digits as its factorization.

111213220121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 111213220121 its reverse (121022312111), we get a palindrome (232235532232).

The spelling of 111213220121 in words is "one hundred eleven billion, two hundred thirteen million, two hundred twenty thousand, one hundred twenty-one".