721705211023 has 8 divisors (see below), whose sum is σ = 746743831200. Its totient is φ = 696676739808.

The previous prime is 721705210999. The next prime is 721705211057. The reversal of 721705211023 is 320112507127.

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 721705211023 - 2²¹ = 721703113871 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 (721705211083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2392411 + ... + 2677132.

It is an arithmetic number, because the mean of its divisors is an integer number (93342978900).

Almost surely, 2^721705211023 is an apocalyptic number.

721705211023 is a deficient number, since it is larger than the sum of its proper divisors (25038620177).

721705211023 is a wasteful number, since it uses less digits than its factorization.

721705211023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5074481.

The product of its (nonzero) digits is 5880, while the sum is 31.

The spelling of 721705211023 in words is "seven hundred twenty-one billion, seven hundred five million, two hundred eleven thousand, twenty-three".