21343140423 has 48 divisors (see below), whose sum is σ = 33863540256. Its totient is φ = 12846366720.

The previous prime is 21343140407. The next prime is 21343140449. The reversal of 21343140423 is 32404134312.

21343140423 is a `hidden beast` number, since 213 + 43 + 1 + 404 + 2 + 3 = 666.

It is not a de Polignac number, because 21343140423 - 2⁴ = 21343140407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343140823) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10099815 + ... + 10101927.

It is an arithmetic number, because the mean of its divisors is an integer number (705490422).

Almost surely, 2^21343140423 is an apocalyptic number.

21343140423 is a deficient number, since it is larger than the sum of its proper divisors (12520399833).

21343140423 is a wasteful number, since it uses less digits than its factorization.

21343140423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2784 (or 2781 counting only the distinct ones).

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

Adding to 21343140423 its reverse (32404134312), we get a palindrome (53747274735).

The spelling of 21343140423 in words is "twenty-one billion, three hundred forty-three million, one hundred forty thousand, four hundred twenty-three".