21707434023 has 8 divisors (see below), whose sum is σ = 31574449536. Its totient is φ = 13156020600.

The previous prime is 21707433983. The next prime is 21707434033. The reversal of 21707434023 is 32043470712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21707434023 - 2¹⁴ = 21707417639 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 657801031 = 21707434023 / (2 + 1 + 7 + 0 + 7 + 4 + 3 + 4 + 0 + 2 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21707434033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 328900483 + ... + 328900548.

It is an arithmetic number, because the mean of its divisors is an integer number (3946806192).

Almost surely, 2^21707434023 is an apocalyptic number.

21707434023 is a deficient number, since it is larger than the sum of its proper divisors (9867015513).

21707434023 is a wasteful number, since it uses less digits than its factorization.

21707434023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657801045.

The product of its (nonzero) digits is 28224, while the sum is 33.

The spelling of 21707434023 in words is "twenty-one billion, seven hundred seven million, four hundred thirty-four thousand, twenty-three".