21116453473 has 4 divisors (see below), whose sum is σ = 21130542000. Its totient is φ = 21102364948.

The previous prime is 21116453437. The next prime is 21116453507. The reversal of 21116453473 is 37435461112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21116453473 - 2⁹ = 21116452961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21116450473) 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, 7042015 + ... + 7045012.

It is an arithmetic number, because the mean of its divisors is an integer number (5282635500).

Almost surely, 2^21116453473 is an apocalyptic number.

It is an amenable number.

21116453473 is a deficient number, since it is larger than the sum of its proper divisors (14088527).

21116453473 is a wasteful number, since it uses less digits than its factorization.

21116453473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14088526.

The product of its digits is 60480, while the sum is 37.

The spelling of 21116453473 in words is "twenty-one billion, one hundred sixteen million, four hundred fifty-three thousand, four hundred seventy-three".