21712724337 has 8 divisors (see below), whose sum is σ = 28965980736. Its totient is φ = 14467308752.

The previous prime is 21712724333. The next prime is 21712724351. The reversal of 21712724337 is 73342721712.

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

It is a cyclic number.

It is not a de Polignac number, because 21712724337 - 2² = 21712724333 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21712724295 and 21712724304.

It is not an unprimeable number, because it can be changed into a prime (21712724333) 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, 1953738 + ... + 1964819.

It is an arithmetic number, because the mean of its divisors is an integer number (3620747592).

Almost surely, 2^21712724337 is an apocalyptic number.

It is an amenable number.

21712724337 is a deficient number, since it is larger than the sum of its proper divisors (7253256399).

21712724337 is a wasteful number, since it uses less digits than its factorization.

21712724337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3920407.

The product of its digits is 98784, while the sum is 39.

The spelling of 21712724337 in words is "twenty-one billion, seven hundred twelve million, seven hundred twenty-four thousand, three hundred thirty-seven".