11004021 has 48 divisors (see below), whose sum is σ = 19843200. Its totient is φ = 5733504.

The previous prime is 11004017. The next prime is 11004023. The reversal of 11004021 is 12040011.

It is a happy number.

It is not a de Polignac number, because 11004021 - 2² = 11004017 is a prime.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11003994 and 11004012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11004023) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 34555 + ... + 34871.

It is an arithmetic number, because the mean of its divisors is an integer number (413400).

Almost surely, 2^11004021 is an apocalyptic number.

It is an amenable number.

11004021 is a deficient number, since it is larger than the sum of its proper divisors (8839179).

11004021 is a wasteful number, since it uses less digits than its factorization.

11004021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378 (or 375 counting only the distinct ones).

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

The square root of 11004021 is about 3317.2309235264. The cubic root of 11004021 is about 222.4251046161.

Adding to 11004021 its reverse (12040011), we get a palindrome (23044032).

The spelling of 11004021 in words is "eleven million, four thousand, twenty-one".