21761024423 has 4 divisors (see below), whose sum is σ = 21932371200. Its totient is φ = 21589677648.

The previous prime is 21761024377. The next prime is 21761024497. The reversal of 21761024423 is 32442016712.

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 21761024423 - 2¹⁴ = 21761008039 is a prime.

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 21761024423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21761024023) 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, 85673198 + ... + 85673451.

It is an arithmetic number, because the mean of its divisors is an integer number (5483092800).

Almost surely, 2^21761024423 is an apocalyptic number.

21761024423 is a deficient number, since it is larger than the sum of its proper divisors (171346777).

21761024423 is a wasteful number, since it uses less digits than its factorization.

21761024423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171346776.

The product of its (nonzero) digits is 16128, while the sum is 32.

The spelling of 21761024423 in words is "twenty-one billion, seven hundred sixty-one million, twenty-four thousand, four hundred twenty-three".