21608440307 has 8 divisors (see below), whose sum is σ = 21679712880. Its totient is φ = 21537204480.

The previous prime is 21608440297. The next prime is 21608440331. The reversal of 21608440307 is 70304480612.

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 21608440307 - 2¹⁰ = 21608439283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21608490307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1651463 + ... + 1664495.

It is an arithmetic number, because the mean of its divisors is an integer number (2709964110).

Almost surely, 2^21608440307 is an apocalyptic number.

21608440307 is a deficient number, since it is larger than the sum of its proper divisors (71272573).

21608440307 is a wasteful number, since it uses less digits than its factorization.

21608440307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18373.

The product of its (nonzero) digits is 32256, while the sum is 35.

The spelling of 21608440307 in words is "twenty-one billion, six hundred eight million, four hundred forty thousand, three hundred seven".