21120033004 has 24 divisors (see below), whose sum is σ = 42400689408. Its totient is φ = 9017023440.

The previous prime is 21120033001. The next prime is 21120033013. The reversal of 21120033004 is 40033002112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21120033001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1426642 + ... + 1441369.

It is an arithmetic number, because the mean of its divisors is an integer number (1766695392).

Almost surely, 2^21120033004 is an apocalyptic number.

It is an amenable number.

21120033004 is an abundant number, since it is smaller than the sum of its proper divisors (21280656404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21120033004 is a wasteful number, since it uses less digits than its factorization.

21120033004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2868285 (or 2868283 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21120033004 its reverse (40033002112), we get a palindrome (61153035116).

The spelling of 21120033004 in words is "twenty-one billion, one hundred twenty million, thirty-three thousand, four".