1108921 has 4 divisors (see below), whose sum is σ = 1209744. Its totient is φ = 1008100.

The previous prime is 1108909. The next prime is 1108957. The reversal of 1108921 is 1298011.

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 1108921 - 2¹⁷ = 977849 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1108892 and 1108901.

It is not an unprimeable number, because it can be changed into a prime (1108021) 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, 50395 + ... + 50416.

It is an arithmetic number, because the mean of its divisors is an integer number (302436).

2^1108921 is an apocalyptic number.

1108921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1108921 is a deficient number, since it is larger than the sum of its proper divisors (100823).

1108921 is a wasteful number, since it uses less digits than its factorization.

1108921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100822.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 1108921 is about 1053.0531800436. The cubic root of 1108921 is about 103.5063202594.

The spelling of 1108921 in words is "one million, one hundred eight thousand, nine hundred twenty-one".