111121101022121 has 4 divisors (see below), whose sum is σ = 112104473597652. Its totient is φ = 110137728446592.

The previous prime is 111121101022103. The next prime is 111121101022133. The reversal of 111121101022121 is 121220101121111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36210968178025 + 74910132844096 = 6017555^2 + 8655064^2 .

It is a cyclic number.

It is not a de Polignac number, because 111121101022121 - 2¹⁴ = 111121101005737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 111121101022121.

It is not an unprimeable number, because it can be changed into a prime (111151101022121) 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, 491686287596 + ... + 491686287821.

It is an arithmetic number, because the mean of its divisors is an integer number (28026118399413).

Almost surely, 2^{111121101022121} is an apocalyptic number.

It is an amenable number.

111121101022121 is a deficient number, since it is larger than the sum of its proper divisors (983372575531).

111121101022121 is an equidigital number, since it uses as much as digits as its factorization.

111121101022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983372575530.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 111121101022121 its reverse (121220101121111), we get a palindrome (232341202143232).

The spelling of 111121101022121 in words is "one hundred eleven trillion, one hundred twenty-one billion, one hundred one million, twenty-two thousand, one hundred twenty-one".