21365880423 has 8 divisors (see below), whose sum is σ = 28662613248. Its totient is φ = 14156533944.

The previous prime is 21365880421. The next prime is 21365880439. The reversal of 21365880423 is 32408856312.

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

It is not a de Polignac number, because 21365880423 - 2¹ = 21365880421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21365880421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21846015 + ... + 21846992.

It is an arithmetic number, because the mean of its divisors is an integer number (3582826656).

Almost surely, 2^21365880423 is an apocalyptic number.

21365880423 is a deficient number, since it is larger than the sum of its proper divisors (7296732825).

21365880423 is a wasteful number, since it uses less digits than its factorization.

21365880423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43693173.

The product of its (nonzero) digits is 276480, while the sum is 42.

The spelling of 21365880423 in words is "twenty-one billion, three hundred sixty-five million, eight hundred eighty thousand, four hundred twenty-three".