21744632112501 has 16 divisors (see below), whose sum is σ = 29262634744896. Its totient is φ = 14361641392896.

The previous prime is 21744632112491. The next prime is 21744632112551. The reversal of 21744632112501 is 10521123644712.

It is a happy number.

It is not a de Polignac number, because 21744632112501 - 2⁷ = 21744632112373 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21744632112501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21744632112551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13742215 + ... + 15242628.

It is an arithmetic number, because the mean of its divisors is an integer number (1828914671556).

Almost surely, 2^{21744632112501} is an apocalyptic number.

It is an amenable number.

21744632112501 is a deficient number, since it is larger than the sum of its proper divisors (7518002632395).

21744632112501 is a wasteful number, since it uses less digits than its factorization.

21744632112501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28987172.

The product of its (nonzero) digits is 80640, while the sum is 39.

The spelling of 21744632112501 in words is "twenty-one trillion, seven hundred forty-four billion, six hundred thirty-two million, one hundred twelve thousand, five hundred one".