21831708343 has 4 divisors (see below), whose sum is σ = 21965645368. Its totient is φ = 21697771320.

The previous prime is 21831708317. The next prime is 21831708389. The reversal of 21831708343 is 34380713812.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21831708343 - 2⁹ = 21831707831 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21831708296 and 21831708305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21831748343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66968268 + ... + 66968593.

It is an arithmetic number, because the mean of its divisors is an integer number (5491411342).

Almost surely, 2^21831708343 is an apocalyptic number.

21831708343 is a deficient number, since it is larger than the sum of its proper divisors (133937025).

21831708343 is a wasteful number, since it uses less digits than its factorization.

21831708343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133937024.

The product of its (nonzero) digits is 96768, while the sum is 40.

The spelling of 21831708343 in words is "twenty-one billion, eight hundred thirty-one million, seven hundred eight thousand, three hundred forty-three".