21432340143 has 24 divisors (see below), whose sum is σ = 31274285328. Its totient is φ = 14142774912.

The previous prime is 21432340121. The next prime is 21432340187. The reversal of 21432340143 is 34104323412.

21432340143 is a `hidden beast` number, since 214 + 3 + 2 + 3 + 401 + 43 = 666.

It is not a de Polignac number, because 21432340143 - 2¹⁰ = 21432339119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21432340103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 402805 + ... + 452897.

It is an arithmetic number, because the mean of its divisors is an integer number (1303095222).

Almost surely, 2^21432340143 is an apocalyptic number.

21432340143 is a deficient number, since it is larger than the sum of its proper divisors (9841945185).

21432340143 is a wasteful number, since it uses less digits than its factorization.

21432340143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50583 (or 50580 counting only the distinct ones).

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

Adding to 21432340143 its reverse (34104323412), we get a palindrome (55536663555).

The spelling of 21432340143 in words is "twenty-one billion, four hundred thirty-two million, three hundred forty thousand, one hundred forty-three".