111001000021 has 4 divisors (see below), whose sum is σ = 111042937312. Its totient is φ = 110959062732.

The previous prime is 111001000007. The next prime is 111001000027. The reversal of 111001000021 is 120000100111.

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 not a de Polignac number, because 111001000021 - 2²¹ = 110998902869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111000999968 and 111001000013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111001000027) 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, 20964675 + ... + 20969968.

It is an arithmetic number, because the mean of its divisors is an integer number (27760734328).

Almost surely, 2^111001000021 is an apocalyptic number.

It is an amenable number.

111001000021 is a deficient number, since it is larger than the sum of its proper divisors (41937291).

111001000021 is an equidigital number, since it uses as much as digits as its factorization.

111001000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41937290.

The product of its (nonzero) digits is 2, while the sum is 7.

Adding to 111001000021 its reverse (120000100111), we get a palindrome (231001100132).

The spelling of 111001000021 in words is "one hundred eleven billion, one million, twenty-one", and thus it is an aban number.