21613272648 has 96 divisors (see below), whose sum is σ = 60997332480. Its totient is φ = 6372432000.

The previous prime is 21613272647. The next prime is 21613272679. The reversal of 21613272648 is 84627231612.

It is not an unprimeable number, because it can be changed into a prime (21613272647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6873 + ... + 208023.

It is an arithmetic number, because the mean of its divisors is an integer number (635388880).

Almost surely, 2^21613272648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21613272648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30498666240).

21613272648 is an abundant number, since it is smaller than the sum of its proper divisors (39384059832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21613272648 is a wasteful number, since it uses less digits than its factorization.

21613272648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201219 (or 201204 counting only the distinct ones).

The product of its digits is 193536, while the sum is 42.

The spelling of 21613272648 in words is "twenty-one billion, six hundred thirteen million, two hundred seventy-two thousand, six hundred forty-eight".