21234560356412 has 48 divisors (see below), whose sum is σ = 40605140808960. Its totient is φ = 9657267752448.

The previous prime is 21234560356411. The next prime is 21234560356417. The reversal of 21234560356412 is 21465306543212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234560356411) 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 15 ways as a sum of consecutive naturals, for example, 1441493 + ... + 6674355.

It is an arithmetic number, because the mean of its divisors is an integer number (845940433520).

Almost surely, 2^{21234560356412} is an apocalyptic number.

It is an amenable number.

21234560356412 is a deficient number, since it is larger than the sum of its proper divisors (19370580452548).

21234560356412 is a wasteful number, since it uses less digits than its factorization.

21234560356412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5234022 (or 5234020 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 44.

Adding to 21234560356412 its reverse (21465306543212), we get a palindrome (42699866899624).

The spelling of 21234560356412 in words is "twenty-one trillion, two hundred thirty-four billion, five hundred sixty million, three hundred fifty-six thousand, four hundred twelve".