21601173423 has 8 divisors (see below), whose sum is σ = 28802320000. Its totient is φ = 14400404568.

The previous prime is 21601173379. The next prime is 21601173431. The reversal of 21601173423 is 32437110612.

It is a happy number.

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

It is not a de Polignac number, because 21601173423 - 2¹⁰ = 21601172399 is a prime.

It is a super-2 number, since 2×21601173423² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21601173443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91068 + ... + 226926.

It is an arithmetic number, because the mean of its divisors is an integer number (3600290000).

Almost surely, 2^21601173423 is an apocalyptic number.

21601173423 is a deficient number, since it is larger than the sum of its proper divisors (7201146577).

21601173423 is a wasteful number, since it uses less digits than its factorization.

21601173423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188861.

The product of its (nonzero) digits is 6048, while the sum is 30.

The spelling of 21601173423 in words is "twenty-one billion, six hundred one million, one hundred seventy-three thousand, four hundred twenty-three".