21744704417640 has 32 divisors (see below), whose sum is σ = 65234113253280. Its totient is φ = 5798587844672.

The previous prime is 21744704417629. The next prime is 21744704417647. The reversal of 21744704417640 is 4671440744712.

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 7 ways as a sum of consecutive naturals, for example, 90602934954 + ... + 90602935193.

It is an arithmetic number, because the mean of its divisors is an integer number (2038566039165).

Almost surely, 2^{21744704417640} is an apocalyptic number.

21744704417640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21744704417640 is an abundant number, since it is smaller than the sum of its proper divisors (43489408835640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21744704417640 is a wasteful number, since it uses less digits than its factorization.

21744704417640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181205870161 (or 181205870157 counting only the distinct ones).

The product of its (nonzero) digits is 4214784, while the sum is 51.

The spelling of 21744704417640 in words is "twenty-one trillion, seven hundred forty-four billion, seven hundred four million, four hundred seventeen thousand, six hundred forty".