21744704417641 has 4 divisors (see below), whose sum is σ = 21744870813952. Its totient is φ = 21744538021332.

The previous prime is 21744704417629. The next prime is 21744704417647. The reversal of 21744704417641 is 14671440744712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21744704417641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21744704417647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83001981 + ... + 83263546.

It is an arithmetic number, because the mean of its divisors is an integer number (5436217703488).

Almost surely, 2^{21744704417641} is an apocalyptic number.

It is an amenable number.

21744704417641 is a deficient number, since it is larger than the sum of its proper divisors (166396311).

21744704417641 is a wasteful number, since it uses less digits than its factorization.

21744704417641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166396310.

The product of its (nonzero) digits is 4214784, while the sum is 52.

The spelling of 21744704417641 in words is "twenty-one trillion, seven hundred forty-four billion, seven hundred four million, four hundred seventeen thousand, six hundred forty-one".