21387665301 has 8 divisors (see below), whose sum is σ = 28571624064. Its totient is φ = 14231075040.

The previous prime is 21387665291. The next prime is 21387665309. The reversal of 21387665301 is 10356678312.

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

It is not a de Polignac number, because 21387665301 - 2³⁰ = 20313923477 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21387665309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6840301 + ... + 6843426.

It is an arithmetic number, because the mean of its divisors is an integer number (3571453008).

Almost surely, 2^21387665301 is an apocalyptic number.

It is an amenable number.

21387665301 is a deficient number, since it is larger than the sum of its proper divisors (7183958763).

21387665301 is a wasteful number, since it uses less digits than its factorization.

21387665301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13684251.

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 21387665301 in words is "twenty-one billion, three hundred eighty-seven million, six hundred sixty-five thousand, three hundred one".