21740171870717 has 32 divisors (see below), whose sum is σ = 23667828307200. Its totient is φ = 19904308250112.

The previous prime is 21740171870713. The next prime is 21740171870731. The reversal of 21740171870717 is 71707817104712.

It is a cyclic number.

It is not a de Polignac number, because 21740171870717 - 2² = 21740171870713 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21740171870713) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23109683 + ... + 24032015.

It is an arithmetic number, because the mean of its divisors is an integer number (739619634600).

Almost surely, 2^{21740171870717} is an apocalyptic number.

It is an amenable number.

21740171870717 is a deficient number, since it is larger than the sum of its proper divisors (1927656436483).

21740171870717 is a wasteful number, since it uses less digits than its factorization.

21740171870717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922757.

The product of its (nonzero) digits is 1075648, while the sum is 53.

The spelling of 21740171870717 in words is "twenty-one trillion, seven hundred forty billion, one hundred seventy-one million, eight hundred seventy thousand, seven hundred seventeen".