21316123473 has 8 divisors (see below), whose sum is σ = 28422363648. Its totient is φ = 14210316144.

The previous prime is 21316123441. The next prime is 21316123481. The reversal of 21316123473 is 37432161312.

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 21316123473 - 2⁵ = 21316123441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21316123273) 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, 33040 + ... + 209102.

It is an arithmetic number, because the mean of its divisors is an integer number (3552795456).

Almost surely, 2^21316123473 is an apocalyptic number.

It is an amenable number.

21316123473 is a deficient number, since it is larger than the sum of its proper divisors (7106240175).

21316123473 is a wasteful number, since it uses less digits than its factorization.

21316123473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216423.

The product of its digits is 18144, while the sum is 33.

Adding to 21316123473 its reverse (37432161312), we get a palindrome (58748284785).

The spelling of 21316123473 in words is "twenty-one billion, three hundred sixteen million, one hundred twenty-three thousand, four hundred seventy-three".