21546628963 has 4 divisors (see below), whose sum is σ = 21546944568. Its totient is φ = 21546313360.

The previous prime is 21546628931. The next prime is 21546628979. The reversal of 21546628963 is 36982664512.

21546628963 is nontrivially palindromic in base 5.

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 21546628963 - 2⁵ = 21546628931 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 21546628963.

It is not an unprimeable number, because it can be changed into a prime (21546628993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7981 + ... + 207742.

It is an arithmetic number, because the mean of its divisors is an integer number (5386736142).

Almost surely, 2^21546628963 is an apocalyptic number.

21546628963 is a deficient number, since it is larger than the sum of its proper divisors (315605).

21546628963 is an equidigital number, since it uses as much as digits as its factorization.

21546628963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315604.

The product of its digits is 3732480, while the sum is 52.

The spelling of 21546628963 in words is "twenty-one billion, five hundred forty-six million, six hundred twenty-eight thousand, nine hundred sixty-three".