21304216404 has 48 divisors (see below), whose sum is σ = 55243048000. Its totient is φ = 7100133408.

The previous prime is 21304216363. The next prime is 21304216429. The reversal of 21304216404 is 40461240312.

It is a happy number.

21304216404 is a `hidden beast` number, since 2 + 13 + 0 + 4 + 2 + 1 + 640 + 4 = 666.

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 736299 + ... + 764685.

Almost surely, 2^21304216404 is an apocalyptic number.

It is an amenable number.

21304216404 is an abundant number, since it is smaller than the sum of its proper divisors (33938831596).

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

21304216404 is a wasteful number, since it uses less digits than its factorization.

21304216404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35349 (or 35341 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 21304216404 its reverse (40461240312), we get a palindrome (61765456716).

The spelling of 21304216404 in words is "twenty-one billion, three hundred four million, two hundred sixteen thousand, four hundred four".