111001021001 has 4 divisors (see below), whose sum is σ = 119539561092. Its totient is φ = 102462480912.

The previous prime is 111001020973. The next prime is 111001021013. The reversal of 111001021001 is 100120100111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100120100111 = 251 ⋅398884861.

It can be written as a sum of positive squares in 2 ways, for example, as 32993089600 + 78007931401 = 181640^2 + 279299^2 .

It is a cyclic number.

It is not a de Polignac number, because 111001021001 - 2¹⁰ = 111001019977 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111001021001.

It is not an unprimeable number, because it can be changed into a prime (111001041001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4269270026 + ... + 4269270051.

It is an arithmetic number, because the mean of its divisors is an integer number (29884890273).

Almost surely, 2^111001021001 is an apocalyptic number.

It is an amenable number.

111001021001 is a deficient number, since it is larger than the sum of its proper divisors (8538540091).

111001021001 is an equidigital number, since it uses as much as digits as its factorization.

111001021001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8538540090.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 111001021001 its reverse (100120100111), we get a palindrome (211121121112).

The spelling of 111001021001 in words is "one hundred eleven billion, one million, twenty-one thousand, one".