11231921 has 4 divisors (see below), whose sum is σ = 11347812. Its totient is φ = 11116032.

The previous prime is 11231911. The next prime is 11231923. The reversal of 11231921 is 12913211.

11231921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1690000 + 9541921 = 1300^2 + 3089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11231921 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11231893 and 11231902.

It is not an unprimeable number, because it can be changed into a prime (11231923) 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, 57800 + ... + 57993.

It is an arithmetic number, because the mean of its divisors is an integer number (2836953).

Almost surely, 2^11231921 is an apocalyptic number.

It is an amenable number.

11231921 is a deficient number, since it is larger than the sum of its proper divisors (115891).

11231921 is an equidigital number, since it uses as much as digits as its factorization.

11231921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115890.

The product of its digits is 108, while the sum is 20.

The square root of 11231921 is about 3351.4058244265. The cubic root of 11231921 is about 223.9501443573.

The spelling of 11231921 in words is "eleven million, two hundred thirty-one thousand, nine hundred twenty-one".