21345555554312 has 32 divisors (see below), whose sum is σ = 43661981858400. Its totient is φ = 9702387868800.

The previous prime is 21345555554299. The next prime is 21345555554321.

21345555554312 is nontrivially palindromic in base 10.

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 7 ways as a sum of consecutive naturals, for example, 4667012 + ... + 8029452.

It is an arithmetic number, because the mean of its divisors is an integer number (1364436933075).

Almost surely, 2^{21345555554312} is an apocalyptic number.

21345555554312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21345555554312 is an abundant number, since it is smaller than the sum of its proper divisors (22316426304088).

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

21345555554312 is a wasteful number, since it uses less digits than its factorization.

21345555554312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3434597 (or 3434593 counting only the distinct ones).

The product of its digits is 9000000, while the sum is 50.

It can be divided in two parts, 2134555 and 5554312, that added together give a palindrome (7688867).

The spelling of 21345555554312 in words is "twenty-one trillion, three hundred forty-five billion, five hundred fifty-five million, five hundred fifty-four thousand, three hundred twelve".