111021100101 has 24 divisors (see below), whose sum is σ = 164849193080. Its totient is φ = 71947564416.

The previous prime is 111021100093. The next prime is 111021100103. The reversal of 111021100101 is 101001120111.

It can be written as a sum of positive squares in 4 ways, for example, as 54377576100 + 56643524001 = 233190^2 + 237999^2 .

It is not a de Polignac number, because 111021100101 - 2³ = 111021100093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111021100103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 211455 + ... + 516483.

Almost surely, 2^111021100101 is an apocalyptic number.

It is an amenable number.

111021100101 is a deficient number, since it is larger than the sum of its proper divisors (53828092979).

111021100101 is a wasteful number, since it uses less digits than its factorization.

111021100101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306165 (or 306162 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 111021100101 its reverse (101001120111), we get a palindrome (212022220212).

The spelling of 111021100101 in words is "one hundred eleven billion, twenty-one million, one hundred thousand, one hundred one".