721217313031399 has 64 divisors (see below), whose sum is σ = 797383388482560. Its totient is φ = 649941472696320.

The previous prime is 721217313031339. The next prime is 721217313031417. The reversal of 721217313031399 is 993130313712127.

It is not a de Polignac number, because 721217313031399 - 2³⁵ = 721182953293031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721217313031339) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5445672609 + ... + 5445805045.

It is an arithmetic number, because the mean of its divisors is an integer number (12459115445040).

Almost surely, 2^{721217313031399} is an apocalyptic number.

721217313031399 is a deficient number, since it is larger than the sum of its proper divisors (76166075451161).

721217313031399 is a wasteful number, since it uses less digits than its factorization.

721217313031399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133640.

The product of its (nonzero) digits is 1285956, while the sum is 52.

The spelling of 721217313031399 in words is "seven hundred twenty-one trillion, two hundred seventeen billion, three hundred thirteen million, thirty-one thousand, three hundred ninety-nine".