21304314792 has 80 divisors (see below), whose sum is σ = 59770265940. Its totient is φ = 7089721344.

The previous prime is 21304314763. The next prime is 21304314799. The reversal of 21304314792 is 29741340312.

It is a happy number.

21304314792 is a `hidden beast` number, since 2 + 130 + 431 + 4 + 7 + 92 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 15349723236 + 5954591556 = 123894^2 + 77166^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21304314799) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 370408 + ... + 424040.

Almost surely, 2^21304314792 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 21304314792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29885132970).

21304314792 is an abundant number, since it is smaller than the sum of its proper divisors (38465951148).

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

21304314792 is a wasteful number, since it uses less digits than its factorization.

21304314792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54264 (or 54251 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The spelling of 21304314792 in words is "twenty-one billion, three hundred four million, three hundred fourteen thousand, seven hundred ninety-two".