21163327488 has 300 divisors, whose sum is σ = 65086271712. Its totient is φ = 6847856640.

The previous prime is 21163327483. The next prime is 21163327499. The reversal of 21163327488 is 88472336112.

21163327488 is a `hidden beast` number, since 2 + 1 + 1 + 633 + 2 + 7 + 4 + 8 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (21163327483) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 49102633 + ... + 49103063.

Almost surely, 2^21163327488 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 21163327488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32543135856).

21163327488 is an abundant number, since it is smaller than the sum of its proper divisors (43922944224).

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

21163327488 is an frugal number, since it uses more digits than its factorization.

21163327488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508 (or 473 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

It can be divided in two parts, 211633 and 27488, that added together give a square (239121 = 489²).

The spelling of 21163327488 in words is "twenty-one billion, one hundred sixty-three million, three hundred twenty-seven thousand, four hundred eighty-eight".