21304050320 has 160 divisors (see below), whose sum is σ = 57356662272. Its totient is φ = 7208165376.

The previous prime is 21304050203. The next prime is 21304050331. The reversal of 21304050320 is 2305040312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21304050292 and 21304050301.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24975014 + ... + 24975866.

Almost surely, 2^21304050320 is an apocalyptic number.

21304050320 is a gapful number since it is divisible by the number (20) 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 21304050320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28678331136).

21304050320 is an abundant number, since it is smaller than the sum of its proper divisors (36052611952).

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

21304050320 is a wasteful number, since it uses less digits than its factorization.

21304050320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1409 (or 1403 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

Adding to 21304050320 its reverse (2305040312), we get a palindrome (23609090632).

The spelling of 21304050320 in words is "twenty-one billion, three hundred four million, fifty thousand, three hundred twenty".