21767131100745 has 24 divisors (see below), whose sum is σ = 37741517940672. Its totient is φ = 11605498423200.

The previous prime is 21767131100707. The next prime is 21767131100851. The reversal of 21767131100745 is 54700113176712.

It is not a de Polignac number, because 21767131100745 - 2¹¹ = 21767131098697 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 21767131100745.

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 23 ways as a sum of consecutive naturals, for example, 75649891 + ... + 75937080.

It is an arithmetic number, because the mean of its divisors is an integer number (1572563247528).

Almost surely, 2^{21767131100745} is an apocalyptic number.

It is an amenable number.

21767131100745 is a deficient number, since it is larger than the sum of its proper divisors (15974386839927).

21767131100745 is a wasteful number, since it uses less digits than its factorization.

21767131100745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151590173 (or 151590170 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 45.

The spelling of 21767131100745 in words is "twenty-one trillion, seven hundred sixty-seven billion, one hundred thirty-one million, one hundred thousand, seven hundred forty-five".