21724676707 has 4 divisors (see below), whose sum is σ = 22473803520. Its totient is φ = 20975549896.

The previous prime is 21724676693. The next prime is 21724676851. The reversal of 21724676707 is 70767642712.

It is a happy number.

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

It is not a de Polignac number, because 21724676707 - 2¹⁹ = 21724152419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21724676107) 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, 374563363 + ... + 374563420.

It is an arithmetic number, because the mean of its divisors is an integer number (5618450880).

Almost surely, 2^21724676707 is an apocalyptic number.

21724676707 is a deficient number, since it is larger than the sum of its proper divisors (749126813).

21724676707 is an equidigital number, since it uses as much as digits as its factorization.

21724676707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749126812.

The product of its (nonzero) digits is 1382976, while the sum is 49.

The spelling of 21724676707 in words is "twenty-one billion, seven hundred twenty-four million, six hundred seventy-six thousand, seven hundred seven".