21371623606640 has 80 divisors (see below), whose sum is σ = 52597845352800. Its totient is φ = 8061917961216.

The previous prime is 21371623606639. The next prime is 21371623606657. The reversal of 21371623606640 is 4660632617312.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

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, 107015435 + ... + 107214954.

It is an arithmetic number, because the mean of its divisors is an integer number (657473066910).

Almost surely, 2^{21371623606640} is an apocalyptic number.

21371623606640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21371623606640 is an abundant number, since it is smaller than the sum of its proper divisors (31226221746160).

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

21371623606640 is a wasteful number, since it uses less digits than its factorization.

21371623606640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214230474 (or 214230468 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 47.

The spelling of 21371623606640 in words is "twenty-one trillion, three hundred seventy-one billion, six hundred twenty-three million, six hundred six thousand, six hundred forty".