111121100020121 has 4 divisors (see below), whose sum is σ = 111220581758052. Its totient is φ = 111021618282192.

The previous prime is 111121100020109. The next prime is 111121100020123. The reversal of 111121100020121 is 121020001121111.

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 59202806480896 + 51918293539225 = 7694336^2 + 7205435^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111121100020121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111121100020096 and 111121100020105.

It is not an unprimeable number, because it can be changed into a prime (111121100020123) 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, 49740867290 + ... + 49740869523.

It is an arithmetic number, because the mean of its divisors is an integer number (27805145439513).

Almost surely, 2^{111121100020121} is an apocalyptic number.

It is an amenable number.

111121100020121 is a deficient number, since it is larger than the sum of its proper divisors (99481737931).

111121100020121 is an equidigital number, since it uses as much as digits as its factorization.

111121100020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99481737930.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 111121100020121 its reverse (121020001121111), we get a palindrome (232141101141232).

The spelling of 111121100020121 in words is "one hundred eleven trillion, one hundred twenty-one billion, one hundred million, twenty thousand, one hundred twenty-one".