111021022121 has 4 divisors (see below), whose sum is σ = 111059189700. Its totient is φ = 110982854544.

The previous prime is 111021022109. The next prime is 111021022139. The reversal of 111021022121 is 121220120111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121220120111 = 1373 ⋅88288507.

It can be written as a sum of positive squares in 2 ways, for example, as 73690531600 + 37330490521 = 271460^2 + 193211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111021022121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111021022096 and 111021022105.

It is not an unprimeable number, because it can be changed into a prime (111024022121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19079426 + ... + 19085243.

It is an arithmetic number, because the mean of its divisors is an integer number (27764797425).

Almost surely, 2^111021022121 is an apocalyptic number.

It is an amenable number.

111021022121 is a deficient number, since it is larger than the sum of its proper divisors (38167579).

111021022121 is an equidigital number, since it uses as much as digits as its factorization.

111021022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38167578.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 111021022121 its reverse (121220120111), we get a palindrome (232241142232).

The spelling of 111021022121 in words is "one hundred eleven billion, twenty-one million, twenty-two thousand, one hundred twenty-one".