21043432445512 has 32 divisors (see below), whose sum is σ = 40019903668800. Its totient is φ = 10371515492800.

The previous prime is 21043432445411. The next prime is 21043432445513. The reversal of 21043432445512 is 21554423434012.

It is not an unprimeable number, because it can be changed into a prime (21043432445513) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 645187 + ... + 6519442.

It is an arithmetic number, because the mean of its divisors is an integer number (1250621989650).

Almost surely, 2^{21043432445512} is an apocalyptic number.

It is an amenable number.

21043432445512 is a deficient number, since it is larger than the sum of its proper divisors (18976471223288).

21043432445512 is a wasteful number, since it uses less digits than its factorization.

21043432445512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7169877 (or 7169873 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 40.

Adding to 21043432445512 its reverse (21554423434012), we get a palindrome (42597855879524).

The spelling of 21043432445512 in words is "twenty-one trillion, forty-three billion, four hundred thirty-two million, four hundred forty-five thousand, five hundred twelve".