111201122121121 has 4 divisors (see below), whose sum is σ = 117742364598852. Its totient is φ = 104659879643392.

The previous prime is 111201122121059. The next prime is 111201122121127. The reversal of 111201122121121 is 121121221102111.

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 67454009615521 + 43747112505600 = 8213039^2 + 6614160^2 .

It is a cyclic number.

It is not a de Polignac number, because 111201122121121 - 2²⁷ = 111200987903393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111201122121127) 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, 3270621238840 + ... + 3270621238873.

It is an arithmetic number, because the mean of its divisors is an integer number (29435591149713).

Almost surely, 2^{111201122121121} is an apocalyptic number.

It is an amenable number.

111201122121121 is a deficient number, since it is larger than the sum of its proper divisors (6541242477731).

111201122121121 is an equidigital number, since it uses as much as digits as its factorization.

111201122121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6541242477730.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 111201122121121 its reverse (121121221102111), we get a palindrome (232322343223232).

The spelling of 111201122121121 in words is "one hundred eleven trillion, two hundred one billion, one hundred twenty-two million, one hundred twenty-one thousand, one hundred twenty-one".