21343243140 has 72 divisors (see below), whose sum is σ = 64759164288. Its totient is φ = 5689949760.

The previous prime is 21343243109. The next prime is 21343243151. The reversal of 21343243140 is 4134234312.

21343243140 is a `hidden beast` number, since 2 + 1 + 343 + 2 + 4 + 314 + 0 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 725559 + ... + 754401.

Almost surely, 2^21343243140 is an apocalyptic number.

21343243140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21343243140 is an abundant number, since it is smaller than the sum of its proper divisors (43415921148).

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

21343243140 is a wasteful number, since it uses less digits than its factorization.

21343243140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32969 (or 32964 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 21343243140 its reverse (4134234312), we get a palindrome (25477477452).

The spelling of 21343243140 in words is "twenty-one billion, three hundred forty-three million, two hundred forty-three thousand, one hundred forty".