111009921 has 8 divisors (see below), whose sum is σ = 161469024. Its totient is φ = 67278720.

The previous prime is 111009907. The next prime is 111009923. The reversal of 111009921 is 129900111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 111009921 - 2⁵ = 111009889 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111009891 and 111009900.

It is not an unprimeable number, because it can be changed into a prime (111009923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1681936 + ... + 1682001.

It is an arithmetic number, because the mean of its divisors is an integer number (20183628).

Almost surely, 2^111009921 is an apocalyptic number.

111009921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111009921 is a deficient number, since it is larger than the sum of its proper divisors (50459103).

111009921 is a wasteful number, since it uses less digits than its factorization.

111009921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3363951.

The product of its (nonzero) digits is 162, while the sum is 24.

The square root of 111009921 is about 10536.1245721565. The cubic root of 111009921 is about 480.6038710490.

The spelling of 111009921 in words is "one hundred eleven million, nine thousand, nine hundred twenty-one".