21052440264 has 128 divisors (see below), whose sum is σ = 56157494400. Its totient is φ = 6564096000.

The previous prime is 21052440259. The next prime is 21052440317. The reversal of 21052440264 is 46204425012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6462124 + ... + 6465380.

It is an arithmetic number, because the mean of its divisors is an integer number (438730425).

Almost surely, 2^21052440264 is an apocalyptic number.

21052440264 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 21052440264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28078747200).

21052440264 is an abundant number, since it is smaller than the sum of its proper divisors (35105054136).

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

21052440264 is a wasteful number, since it uses less digits than its factorization.

21052440264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3583 (or 3579 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

Adding to 21052440264 its reverse (46204425012), we get a palindrome (67256865276).

The spelling of 21052440264 in words is "twenty-one billion, fifty-two million, four hundred forty thousand, two hundred sixty-four".