21304040472 has 512 divisors, whose sum is σ = 75608064000. Its totient is φ = 5458752000.

The previous prime is 21304040437. The next prime is 21304040473. The reversal of 21304040472 is 27404040312.

21304040472 is a `hidden beast` number, since 213 + 0 + 40 + 404 + 7 + 2 = 666.

It is a super-2 number, since 2×21304040472² (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 not an unprimeable number, because it can be changed into a prime (21304040473) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 18192447 + ... + 18193617.

It is an arithmetic number, because the mean of its divisors is an integer number (147672000).

Almost surely, 2^21304040472 is an apocalyptic number.

21304040472 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21304040472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37804032000).

21304040472 is an abundant number, since it is smaller than the sum of its proper divisors (54304023528).

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

21304040472 is a wasteful number, since it uses less digits than its factorization.

21304040472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260 (or 1250 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 27.

Adding to 21304040472 its reverse (27404040312), we get a palindrome (48708080784).

The spelling of 21304040472 in words is "twenty-one billion, three hundred four million, forty thousand, four hundred seventy-two".