21404304116 has 12 divisors (see below), whose sum is σ = 40338880932. Its totient is φ = 9878909568.

The previous prime is 21404304071. The next prime is 21404304149. The reversal of 21404304116 is 61140340412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10971724516 + 10432579600 = 104746^2 + 102140^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205810565 + ... + 205810668.

It is an arithmetic number, because the mean of its divisors is an integer number (3361573411).

Almost surely, 2^21404304116 is an apocalyptic number.

21404304116 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21404304116 is a deficient number, since it is larger than the sum of its proper divisors (18934576816).

21404304116 is a wasteful number, since it uses less digits than its factorization.

21404304116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411621250 (or 411621248 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 21404304116 its reverse (61140340412), we get a palindrome (82544644528).

The spelling of 21404304116 in words is "twenty-one billion, four hundred four million, three hundred four thousand, one hundred sixteen".