21653147616 has 96 divisors (see below), whose sum is σ = 57300203520. Its totient is φ = 7159466496.

The previous prime is 21653147611. The next prime is 21653147617. The reversal of 21653147616 is 61674135612.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21653147611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6353785 + ... + 6357191.

It is an arithmetic number, because the mean of its divisors is an integer number (596877120).

Almost surely, 2^21653147616 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 21653147616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28650101760).

21653147616 is an abundant number, since it is smaller than the sum of its proper divisors (35647055904).

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

21653147616 is a wasteful number, since it uses less digits than its factorization.

21653147616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3936 (or 3928 counting only the distinct ones).

The product of its digits is 181440, while the sum is 42.

The spelling of 21653147616 in words is "twenty-one billion, six hundred fifty-three million, one hundred forty-seven thousand, six hundred sixteen".