201111100121 has 16 divisors (see below), whose sum is σ = 217064318400. Its totient is φ = 185644988928.

The previous prime is 201111100081. The next prime is 201111100129. The reversal of 201111100121 is 121001111102.

It is a cyclic number.

It is not a de Polignac number, because 201111100121 - 2¹⁰ = 201111099097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201111100129) 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 15 ways as a sum of consecutive naturals, for example, 230531 + ... + 674808.

It is an arithmetic number, because the mean of its divisors is an integer number (13566519900).

Almost surely, 2^201111100121 is an apocalyptic number.

It is an amenable number.

201111100121 is a deficient number, since it is larger than the sum of its proper divisors (15953218279).

201111100121 is a wasteful number, since it uses less digits than its factorization.

201111100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905608.

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

Adding to 201111100121 its reverse (121001111102), we get a palindrome (322112211223).

The spelling of 201111100121 in words is "two hundred one billion, one hundred eleven million, one hundred thousand, one hundred twenty-one".