21706832343 has 16 divisors (see below), whose sum is σ = 33542954496. Its totient is φ = 12229200480.

The previous prime is 21706832339. The next prime is 21706832351. The reversal of 21706832343 is 34323860712.

It is not a de Polignac number, because 21706832343 - 2² = 21706832339 is a prime.

It is a super-2 number, since 2×21706832343² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21706822343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7277796 + ... + 7280777.

It is an arithmetic number, because the mean of its divisors is an integer number (2096434656).

Almost surely, 2^21706832343 is an apocalyptic number.

21706832343 is a deficient number, since it is larger than the sum of its proper divisors (11836122153).

21706832343 is a wasteful number, since it uses less digits than its factorization.

21706832343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14558654.

The product of its (nonzero) digits is 145152, while the sum is 39.

The spelling of 21706832343 in words is "twenty-one billion, seven hundred six million, eight hundred thirty-two thousand, three hundred forty-three".