21560445383 has 4 divisors (see below), whose sum is σ = 21673327488. Its totient is φ = 21447563280.

The previous prime is 21560445349. The next prime is 21560445427. The reversal of 21560445383 is 38354406512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21560445383 is a prime.

It is a super-2 number, since 2×21560445383² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21560445383.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21560445083) 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, 56440766 + ... + 56441147.

It is an arithmetic number, because the mean of its divisors is an integer number (5418331872).

Almost surely, 2^21560445383 is an apocalyptic number.

21560445383 is a deficient number, since it is larger than the sum of its proper divisors (112882105).

21560445383 is a wasteful number, since it uses less digits than its factorization.

21560445383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112882104.

The product of its (nonzero) digits is 345600, while the sum is 41.

The spelling of 21560445383 in words is "twenty-one billion, five hundred sixty million, four hundred forty-five thousand, three hundred eighty-three".