111111122121001 has 4 divisors (see below), whose sum is σ = 115942040474112. Its totient is φ = 106280203767892.

The previous prime is 111111122120953. The next prime is 111111122121031. The reversal of 111111122121001 is 100121221111111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 111111122121001 - 2²³ = 111111113732393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111111122121031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2415459176521 + ... + 2415459176566.

It is an arithmetic number, because the mean of its divisors is an integer number (28985510118528).

Almost surely, 2^{111111122121001} is an apocalyptic number.

It is an amenable number.

111111122121001 is a deficient number, since it is larger than the sum of its proper divisors (4830918353111).

111111122121001 is an equidigital number, since it uses as much as digits as its factorization.

111111122121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4830918353110.

The product of its (nonzero) digits is 8, while the sum is 16.

Adding to 111111122121001 its reverse (100121221111111), we get a palindrome (211232343232112).

The spelling of 111111122121001 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred twenty-two million, one hundred twenty-one thousand, one".