21385765307 has 8 divisors (see below), whose sum is σ = 22836858240. Its totient is φ = 19982249280.

The previous prime is 21385765259. The next prime is 21385765319. The reversal of 21385765307 is 70356758312.

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 21385765307 - 2¹⁸ = 21385503163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21385765367) 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, 11893298 + ... + 11895095.

It is an arithmetic number, because the mean of its divisors is an integer number (2854607280).

Almost surely, 2^21385765307 is an apocalyptic number.

21385765307 is a deficient number, since it is larger than the sum of its proper divisors (1451092933).

21385765307 is a wasteful number, since it uses less digits than its factorization.

21385765307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23788453.

The product of its (nonzero) digits is 1058400, while the sum is 47.

The spelling of 21385765307 in words is "twenty-one billion, three hundred eighty-five million, seven hundred sixty-five thousand, three hundred seven".