11040021 has 24 divisors (see below), whose sum is σ = 17184960. Its totient is φ = 6804096.

The previous prime is 11040019. The next prime is 11040031. The reversal of 11040021 is 12004011.

It is a happy number.

It is not a de Polignac number, because 11040021 - 2¹ = 11040019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 11039985 and 11040012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11040011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8416 + ... + 9638.

It is an arithmetic number, because the mean of its divisors is an integer number (716040).

Almost surely, 2^11040021 is an apocalyptic number.

It is an amenable number.

11040021 is a deficient number, since it is larger than the sum of its proper divisors (6144939).

11040021 is a wasteful number, since it uses less digits than its factorization.

11040021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1305 (or 1302 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 11040021 is about 3322.6527052944. The cubic root of 11040021 is about 222.6673974880.

Adding to 11040021 its reverse (12004011), we get a palindrome (23044032).

The spelling of 11040021 in words is "eleven million, forty thousand, twenty-one".