21432540213512 has 64 divisors (see below), whose sum is σ = 41742149644800. Its totient is φ = 10305708549120.

The previous prime is 21432540213473. The next prime is 21432540213599. The reversal of 21432540213512 is 21531204523412.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66115568 + ... + 66438944.

It is an arithmetic number, because the mean of its divisors is an integer number (652221088200).

Almost surely, 2^{21432540213512} is an apocalyptic number.

It is an amenable number.

21432540213512 is a deficient number, since it is larger than the sum of its proper divisors (20309609431288).

21432540213512 is a wasteful number, since it uses less digits than its factorization.

21432540213512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325086 (or 325082 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

Adding to 21432540213512 its reverse (21531204523412), we get a palindrome (42963744736924).

The spelling of 21432540213512 in words is "twenty-one trillion, four hundred thirty-two billion, five hundred forty million, two hundred thirteen thousand, five hundred twelve".