21710565343 has 4 divisors (see below), whose sum is σ = 22987657440. Its totient is φ = 20433473248.

The previous prime is 21710565341. The next prime is 21710565379. The reversal of 21710565343 is 34356501712.

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 21710565343 - 2¹ = 21710565341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21710565341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 638546023 + ... + 638546056.

It is an arithmetic number, because the mean of its divisors is an integer number (5746914360).

Almost surely, 2^21710565343 is an apocalyptic number.

21710565343 is a deficient number, since it is larger than the sum of its proper divisors (1277092097).

21710565343 is a wasteful number, since it uses less digits than its factorization.

21710565343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1277092096.

The product of its (nonzero) digits is 75600, while the sum is 37.

The spelling of 21710565343 in words is "twenty-one billion, seven hundred ten million, five hundred sixty-five thousand, three hundred forty-three".