21744636347372 has 6 divisors (see below), whose sum is σ = 38053113607908. Its totient is φ = 10872318173684.

The previous prime is 21744636347353. The next prime is 21744636347377. The reversal of 21744636347372 is 27374363644712.

It is not an unprimeable number, because it can be changed into a prime (21744636347377) by changing a digit.

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 as a sum of consecutive naturals, namely, 2718079543418 + ... + 2718079543425.

It is an arithmetic number, because the mean of its divisors is an integer number (6342185601318).

Almost surely, 2^{21744636347372} is an apocalyptic number.

It is an amenable number.

21744636347372 is a deficient number, since it is larger than the sum of its proper divisors (16308477260536).

21744636347372 is a wasteful number, since it uses less digits than its factorization.

21744636347372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5436159086847 (or 5436159086845 counting only the distinct ones).

The product of its digits is 85349376, while the sum is 59.

The spelling of 21744636347372 in words is "twenty-one trillion, seven hundred forty-four billion, six hundred thirty-six million, three hundred forty-seven thousand, three hundred seventy-two".