111700021 has 4 divisors (see below), whose sum is σ = 111873312. Its totient is φ = 111526732.

The previous prime is 111700007. The next prime is 111700033. The reversal of 111700021 is 120007111.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111700021 is a prime.

It is a super-3 number, since 3×111700021³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111699974 and 111700010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111700051) 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, 85675 + ... + 86968.

It is an arithmetic number, because the mean of its divisors is an integer number (27968328).

Almost surely, 2^111700021 is an apocalyptic number.

It is an amenable number.

111700021 is a deficient number, since it is larger than the sum of its proper divisors (173291).

111700021 is an equidigital number, since it uses as much as digits as its factorization.

111700021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173290.

The product of its (nonzero) digits is 14, while the sum is 13.

The square root of 111700021 is about 10568.8230659804. The cubic root of 111700021 is about 481.5977156256.

Adding to 111700021 its reverse (120007111), we get a palindrome (231707132).

The spelling of 111700021 in words is "one hundred eleven million, seven hundred thousand, twenty-one".