21312234505260 has 144 divisors (see below), whose sum is σ = 66424057068096. Its totient is φ = 5527185071616.

The previous prime is 21312234505189. The next prime is 21312234505283. The reversal of 21312234505260 is 6250543221312.

21312234505260 is a `hidden beast` number, since 2 + 1 + 3 + 122 + 3 + 4 + 5 + 0 + 526 + 0 = 666.

21312234505260 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×21312234505260² (a number of 27 digits) contains 22 as substring.

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

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 47 ways as a sum of consecutive naturals, for example, 14183169 + ... + 15613671.

It is an arithmetic number, because the mean of its divisors is an integer number (461278174084).

Almost surely, 2^{21312234505260} is an apocalyptic number.

21312234505260 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 21312234505260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33212028534048).

21312234505260 is an abundant number, since it is smaller than the sum of its proper divisors (45111822562836).

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

21312234505260 is a wasteful number, since it uses less digits than its factorization.

21312234505260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1432792 (or 1432787 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

Adding to 21312234505260 its reverse (6250543221312), we get a palindrome (27562777726572).

The spelling of 21312234505260 in words is "twenty-one trillion, three hundred twelve billion, two hundred thirty-four million, five hundred five thousand, two hundred sixty".