21548532613 has 8 divisors (see below), whose sum is σ = 21906097920. Its totient is φ = 21191106480.

The previous prime is 21548532571. The next prime is 21548532641. The reversal of 21548532613 is 31623584512.

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

It is a cyclic number.

It is not a de Polignac number, because 21548532613 - 2⁹ = 21548532101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21548532673) 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, 304656 + ... + 368662.

It is an arithmetic number, because the mean of its divisors is an integer number (2738262240).

Almost surely, 2^21548532613 is an apocalyptic number.

It is an amenable number.

21548532613 is a deficient number, since it is larger than the sum of its proper divisors (357565307).

21548532613 is an equidigital number, since it uses as much as digits as its factorization.

21548532613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69587.

The product of its digits is 172800, while the sum is 40.

The spelling of 21548532613 in words is "twenty-one billion, five hundred forty-eight million, five hundred thirty-two thousand, six hundred thirteen".