111021100121 has 4 divisors (see below), whose sum is σ = 111021801744. Its totient is φ = 111020398500.

The previous prime is 111021100111. The next prime is 111021100139. The reversal of 111021100121 is 121001120111.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111021100121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111021100111) 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, 10766 + ... + 471336.

It is an arithmetic number, because the mean of its divisors is an integer number (27755450436).

Almost surely, 2^111021100121 is an apocalyptic number.

It is an amenable number.

111021100121 is a deficient number, since it is larger than the sum of its proper divisors (701623).

111021100121 is an equidigital number, since it uses as much as digits as its factorization.

111021100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701622.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 111021100121 its reverse (121001120111), we get a palindrome (232022220232).

The spelling of 111021100121 in words is "one hundred eleven billion, twenty-one million, one hundred thousand, one hundred twenty-one".