21133321104 has 80 divisors (see below), whose sum is σ = 65106404352. Its totient is φ = 5775563904.

The previous prime is 21133321051. The next prime is 21133321123. The reversal of 21133321104 is 40112333112.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1359594 + ... + 1375049.

Almost surely, 2^21133321104 is an apocalyptic number.

21133321104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21133321104 is an abundant number, since it is smaller than the sum of its proper divisors (43973083248).

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

21133321104 is a wasteful number, since it uses less digits than its factorization.

21133321104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2734684 (or 2734678 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21133321104 its reverse (40112333112), we get a palindrome (61245654216).

The spelling of 21133321104 in words is "twenty-one billion, one hundred thirty-three million, three hundred twenty-one thousand, one hundred four".