21547982522553 has 8 divisors (see below), whose sum is σ = 28857210075168. Its totient is φ = 14302038325824.

The previous prime is 21547982522519. The next prime is 21547982522557. The reversal of 21547982522553 is 35522528974512.

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

It is not a de Polignac number, because 21547982522553 - 2¹⁰ = 21547982521529 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (21547982522557) 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, 15820838176 + ... + 15820839537.

It is an arithmetic number, because the mean of its divisors is an integer number (3607151259396).

Almost surely, 2^{21547982522553} is an apocalyptic number.

It is an amenable number.

21547982522553 is a deficient number, since it is larger than the sum of its proper divisors (7309227552615).

21547982522553 is a wasteful number, since it uses less digits than its factorization.

21547982522553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31641677943.

The product of its digits is 60480000, while the sum is 60.

The spelling of 21547982522553 in words is "twenty-one trillion, five hundred forty-seven billion, nine hundred eighty-two million, five hundred twenty-two thousand, five hundred fifty-three".