21324340140 has 72 divisors (see below), whose sum is σ = 61696519920. Its totient is φ = 5503040640.

The previous prime is 21324340127. The next prime is 21324340151. The reversal of 21324340140 is 4104342312.

It is a self number, because there is not a number n which added to its sum of digits gives 21324340140.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 127255 + ... + 242574.

It is an arithmetic number, because the mean of its divisors is an integer number (856896110).

Almost surely, 2^21324340140 is an apocalyptic number.

21324340140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21324340140 is an abundant number, since it is smaller than the sum of its proper divisors (40372179780).

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

21324340140 is a wasteful number, since it uses less digits than its factorization.

21324340140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369903 (or 369870 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21324340140 its reverse (4104342312), we get a palindrome (25428682452).

The spelling of 21324340140 in words is "twenty-one billion, three hundred twenty-four million, three hundred forty thousand, one hundred forty".