21324330340 has 12 divisors (see below), whose sum is σ = 44781093756. Its totient is φ = 8529732128.

The previous prime is 21324330319. The next prime is 21324330397. The reversal of 21324330340 is 4303342312.

It can be written as a sum of positive squares in 2 ways, for example, as 16141194304 + 5183136036 = 127048^2 + 71994^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 533108239 + ... + 533108278.

It is an arithmetic number, because the mean of its divisors is an integer number (3731757813).

Almost surely, 2^21324330340 is an apocalyptic number.

21324330340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21324330340 is an abundant number, since it is smaller than the sum of its proper divisors (23456763416).

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

21324330340 is a wasteful number, since it uses less digits than its factorization.

21324330340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066216526 (or 1066216524 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 25.

Adding to 21324330340 its reverse (4303342312), we get a palindrome (25627672652).

The spelling of 21324330340 in words is "twenty-one billion, three hundred twenty-four million, three hundred thirty thousand, three hundred forty".