21163452264 has 96 divisors (see below), whose sum is σ = 59391820800. Its totient is φ = 6800008320.

The previous prime is 21163452259. The next prime is 21163452361. The reversal of 21163452264 is 46225436112.

21163452264 is a `hidden beast` number, since 2 + 11 + 63 + 4 + 522 + 64 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1309497 + ... + 1325559.

It is an arithmetic number, because the mean of its divisors is an integer number (618664800).

Almost surely, 2^21163452264 is an apocalyptic number.

21163452264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21163452264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29695910400).

21163452264 is an abundant number, since it is smaller than the sum of its proper divisors (38228368536).

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

21163452264 is a wasteful number, since it uses less digits than its factorization.

21163452264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16735 (or 16728 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

Adding to 21163452264 its reverse (46225436112), we get a palindrome (67388888376).

The spelling of 21163452264 in words is "twenty-one billion, one hundred sixty-three million, four hundred fifty-two thousand, two hundred sixty-four".