11004421021 has 4 divisors (see below), whose sum is σ = 12004822944. Its totient is φ = 10004019100.

The previous prime is 11004421009. The next prime is 11004421027. The reversal of 11004421021 is 12012440011.

It is a happy number.

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 11004421021 - 2¹⁷ = 11004289949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11004420986 and 11004421004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11004421027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500200945 + ... + 500200966.

It is an arithmetic number, because the mean of its divisors is an integer number (3001205736).

Almost surely, 2^11004421021 is an apocalyptic number.

11004421021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11004421021 is a deficient number, since it is larger than the sum of its proper divisors (1000401923).

11004421021 is a wasteful number, since it uses less digits than its factorization.

11004421021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000401922.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 11004421021 its reverse (12012440011), we get a palindrome (23016861032).

The spelling of 11004421021 in words is "eleven billion, four million, four hundred twenty-one thousand, twenty-one".