1720721602271 has 8 divisors (see below), whose sum is σ = 1966552126464. Its totient is φ = 1474894366200.

The previous prime is 1720721602211. The next prime is 1720721602309. The reversal of 1720721602271 is 1722061270271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1720721602271 - 2³⁴ = 1703541733087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720721602211) 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, 425606 + ... + 1903308.

It is an arithmetic number, because the mean of its divisors is an integer number (245819015808).

Almost surely, 2^{1720721602271} is an apocalyptic number.

1720721602271 is a deficient number, since it is larger than the sum of its proper divisors (245830524193).

1720721602271 is a wasteful number, since it uses less digits than its factorization.

1720721602271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644061.

The product of its (nonzero) digits is 32928, while the sum is 38.

The spelling of 1720721602271 in words is "one trillion, seven hundred twenty billion, seven hundred twenty-one million, six hundred two thousand, two hundred seventy-one".