21126003404 has 96 divisors (see below), whose sum is σ = 44241120000. Its totient is φ = 8719038720.

The previous prime is 21126003391. The next prime is 21126003421. The reversal of 21126003404 is 40430062112.

It is a self number, because there is not a number n which added to its sum of digits gives 21126003404.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 3366782 + ... + 3373050.

It is an arithmetic number, because the mean of its divisors is an integer number (460845000).

Almost surely, 2^21126003404 is an apocalyptic number.

It is an amenable number.

21126003404 is an abundant number, since it is smaller than the sum of its proper divisors (23115116596).

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

21126003404 is a wasteful number, since it uses less digits than its factorization.

21126003404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6471 (or 6469 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21126003404 its reverse (40430062112), we get a palindrome (61556065516).

The spelling of 21126003404 in words is "twenty-one billion, one hundred twenty-six million, three thousand, four hundred four".