21385106383 has 4 divisors (see below), whose sum is σ = 21401827840. Its totient is φ = 21368384928.

The previous prime is 21385106381. The next prime is 21385106387. The reversal of 21385106383 is 38360158312.

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

It is a cyclic number.

It is not a de Polignac number, because 21385106383 - 2¹ = 21385106381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21385106381) 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, 8358810 + ... + 8361367.

It is an arithmetic number, because the mean of its divisors is an integer number (5350456960).

Almost surely, 2^21385106383 is an apocalyptic number.

21385106383 is a deficient number, since it is larger than the sum of its proper divisors (16721457).

21385106383 is a wasteful number, since it uses less digits than its factorization.

21385106383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16721456.

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 21385106383 in words is "twenty-one billion, three hundred eighty-five million, one hundred six thousand, three hundred eighty-three".