21047133204 has 96 divisors (see below), whose sum is σ = 56978638080. Its totient is φ = 6706022400.

The previous prime is 21047133199. The next prime is 21047133221. The reversal of 21047133204 is 40233174012.

It is a happy number.

It is a super-2 number, since 2×21047133204² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6260484 + ... + 6263844.

It is an arithmetic number, because the mean of its divisors is an integer number (593527480).

Almost surely, 2^21047133204 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21047133204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28489319040).

21047133204 is an abundant number, since it is smaller than the sum of its proper divisors (35931504876).

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

21047133204 is a wasteful number, since it uses less digits than its factorization.

21047133204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5918 (or 5910 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The spelling of 21047133204 in words is "twenty-one billion, forty-seven million, one hundred thirty-three thousand, two hundred four".