21304340330 has 128 divisors (see below), whose sum is σ = 52604536320. Its totient is φ = 6011781120.

The previous prime is 21304340327. The next prime is 21304340333. The reversal of 21304340330 is 3304340312.

It is an interprime number because it is at equal distance from previous prime (21304340327) and next prime (21304340333).

It is a junction number, because it is equal to n+sod(n) for n = 21304340296 and 21304340305.

It is not an unprimeable number, because it can be changed into a prime (21304340333) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 257690 + ... + 330170.

It is an arithmetic number, because the mean of its divisors is an integer number (410972940).

Almost surely, 2^21304340330 is an apocalyptic number.

21304340330 is an abundant number, since it is smaller than the sum of its proper divisors (31300195990).

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

21304340330 is a wasteful number, since it uses less digits than its factorization.

21304340330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72544.

The product of its (nonzero) digits is 2592, while the sum is 23.

Adding to 21304340330 its reverse (3304340312), we get a palindrome (24608680642).

The spelling of 21304340330 in words is "twenty-one billion, three hundred four million, three hundred forty thousand, three hundred thirty".