111021120121 has 2 divisors, whose sum is σ = 111021120122. Its totient is φ = 111021120120.

The previous prime is 111021120113. The next prime is 111021120127. The reversal of 111021120121 is 121021120111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107804528896 + 3216591225 = 328336^2 + 56715^2 .

It is an emirp because it is prime and its reverse (121021120111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111021120121 - 2³ = 111021120113 is a prime.

It is a super-2 number, since 2×111021120121² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111021120127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55510560060 + 55510560061.

It is an arithmetic number, because the mean of its divisors is an integer number (55510560061).

Almost surely, 2^111021120121 is an apocalyptic number.

It is an amenable number.

111021120121 is a deficient number, since it is larger than the sum of its proper divisors (1).

111021120121 is an equidigital number, since it uses as much as digits as its factorization.

111021120121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111021120121 its reverse (121021120111), we get a palindrome (232042240232).

The spelling of 111021120121 in words is "one hundred eleven billion, twenty-one million, one hundred twenty thousand, one hundred twenty-one".