21543066034512 has 80 divisors (see below), whose sum is σ = 61443750348288. Its totient is φ = 6449548781440.

The previous prime is 21543066034507. The next prime is 21543066034513.

21543066034512 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21543066034513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245746908 + ... + 245834555.

Almost surely, 2^{21543066034512} is an apocalyptic number.

21543066034512 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21543066034512 is an abundant number, since it is smaller than the sum of its proper divisors (39900684313776).

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

21543066034512 is a wasteful number, since it uses less digits than its factorization.

21543066034512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491581568 (or 491581562 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 42.

It can be divided in two parts, 2154306 and 6034512, that added together give a palindrome (8188818).

The spelling of 21543066034512 in words is "twenty-one trillion, five hundred forty-three billion, sixty-six million, thirty-four thousand, five hundred twelve".