21365326260 has 120 divisors (see below), whose sum is σ = 67320237600. Its totient is φ = 5672223936.

The previous prime is 21365326253. The next prime is 21365326271. The reversal of 21365326260 is 6262356312.

21365326260 is a `hidden beast` number, since 2 + 1 + 3 + 6 + 532 + 62 + 60 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 338691 + ... + 396789.

It is an arithmetic number, because the mean of its divisors is an integer number (561001980).

Almost surely, 2^21365326260 is an apocalyptic number.

21365326260 is a gapful number since it is divisible by the number (20) 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 21365326260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33660118800).

21365326260 is an abundant number, since it is smaller than the sum of its proper divisors (45954911340).

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

21365326260 is a wasteful number, since it uses less digits than its factorization.

21365326260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58347 (or 58336 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The spelling of 21365326260 in words is "twenty-one billion, three hundred sixty-five million, three hundred twenty-six thousand, two hundred sixty".