111102100021001 has 4 divisors (see below), whose sum is σ = 111102125900100. Its totient is φ = 111102074141904.

The previous prime is 111102100020997. The next prime is 111102100021019. The reversal of 111102100021001 is 100120001201111.

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 78997966086400 + 32104133934601 = 8888080^2 + 5666051^2 .

It is a cyclic number.

It is not a de Polignac number, because 111102100021001 - 2² = 111102100020997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111102100021021) 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, 4788206 + ... + 15656663.

It is an arithmetic number, because the mean of its divisors is an integer number (27775531475025).

Almost surely, 2^{111102100021001} is an apocalyptic number.

It is an amenable number.

111102100021001 is a deficient number, since it is larger than the sum of its proper divisors (25879099).

111102100021001 is an equidigital number, since it uses as much as digits as its factorization.

111102100021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25879098.

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

Adding to 111102100021001 its reverse (100120001201111), we get a palindrome (211222101222112).

The spelling of 111102100021001 in words is "one hundred eleven trillion, one hundred two billion, one hundred million, twenty-one thousand, one".