21324242140 has 96 divisors (see below), whose sum is σ = 46302036480. Its totient is φ = 8245920000.

The previous prime is 21324242129. The next prime is 21324242161. The reversal of 21324242140 is 4124242312.

It is a congruent number.

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, 25415841 + ... + 25416679.

It is an arithmetic number, because the mean of its divisors is an integer number (482312880).

Almost surely, 2^21324242140 is an apocalyptic number.

21324242140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21324242140 is an abundant number, since it is smaller than the sum of its proper divisors (24977794340).

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

21324242140 is a wasteful number, since it uses less digits than its factorization.

21324242140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1243 (or 1241 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21324242140 its reverse (4124242312), we get a palindrome (25448484452).

The spelling of 21324242140 in words is "twenty-one billion, three hundred twenty-four million, two hundred forty-two thousand, one hundred forty".