21136465347568 has 40 divisors (see below), whose sum is σ = 41043654288000. Its totient is φ = 10544559049920.

The previous prime is 21136465347563. The next prime is 21136465347617. The reversal of 21136465347568 is 86574356463112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21136465347563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78313813 + ... + 78583243.

It is an arithmetic number, because the mean of its divisors is an integer number (1026091357200).

Almost surely, 2^{21136465347568} is an apocalyptic number.

It is an amenable number.

21136465347568 is a deficient number, since it is larger than the sum of its proper divisors (19907188940432).

21136465347568 is a wasteful number, since it uses less digits than its factorization.

21136465347568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280405 (or 280399 counting only the distinct ones).

The product of its digits is 87091200, while the sum is 61.

The spelling of 21136465347568 in words is "twenty-one trillion, one hundred thirty-six billion, four hundred sixty-five million, three hundred forty-seven thousand, five hundred sixty-eight".