21456175616 has 40 divisors (see below), whose sum is σ = 42963512064. Its totient is φ = 10704798720.

The previous prime is 21456175597. The next prime is 21456175633. The reversal of 21456175616 is 61657165412.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191801 + ... + 282311.

Almost surely, 2^21456175616 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 21456175616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21481756032).

21456175616 is an abundant number, since it is smaller than the sum of its proper divisors (21507336448).

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

21456175616 is an frugal number, since it uses more digits than its factorization.

21456175616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90992 (or 90976 counting only the distinct ones).

The product of its digits is 302400, while the sum is 44.

The spelling of 21456175616 in words is "twenty-one billion, four hundred fifty-six million, one hundred seventy-five thousand, six hundred sixteen".