11547921 has 16 divisors (see below), whose sum is σ = 19196928. Its totient is φ = 5998800.

The previous prime is 11547917. The next prime is 11547929. The reversal of 11547921 is 12974511.

It is not a de Polignac number, because 11547921 - 2² = 11547917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11547929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24765 + ... + 25226.

It is an arithmetic number, because the mean of its divisors is an integer number (1199808).

Almost surely, 2^11547921 is an apocalyptic number.

11547921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11547921 is a deficient number, since it is larger than the sum of its proper divisors (7649007).

11547921 is a wasteful number, since it uses less digits than its factorization.

11547921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50012.

The product of its digits is 2520, while the sum is 30.

The square root of 11547921 is about 3398.2232122096. The cubic root of 11547921 is about 226.0309626829.

The spelling of 11547921 in words is "eleven million, five hundred forty-seven thousand, nine hundred twenty-one".