21764615641372 has 24 divisors (see below), whose sum is σ = 42451107909840. Its totient is φ = 9703110378240.

The previous prime is 21764615641367. The next prime is 21764615641387. The reversal of 21764615641372 is 27314651646712.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8422837579 + ... + 8422840162.

It is an arithmetic number, because the mean of its divisors is an integer number (1768796162910).

Almost surely, 2^{21764615641372} is an apocalyptic number.

It is an amenable number.

21764615641372 is a deficient number, since it is larger than the sum of its proper divisors (20686492268468).

21764615641372 is a wasteful number, since it uses less digits than its factorization.

21764615641372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16845677781 (or 16845677779 counting only the distinct ones).

The product of its digits is 10160640, while the sum is 55.

The spelling of 21764615641372 in words is "twenty-one trillion, seven hundred sixty-four billion, six hundred fifteen million, six hundred forty-one thousand, three hundred seventy-two".