721217313031401 has 6 divisors (see below), whose sum is σ = 1041758341045370. Its totient is φ = 480811542020928.

The previous prime is 721217313031339. The next prime is 721217313031417. The reversal of 721217313031401 is 104130313712127.

721217313031401 is a `hidden beast` number, since 7 + 2 + 1 + 21 + 7 + 313 + 0 + 314 + 0 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 466803679809600 + 254413633221801 = 21605640^2 + 15950349^2 .

It is not a de Polignac number, because 721217313031401 - 2³⁴ = 721200133162217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721217313131401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40067628501736 + ... + 40067628501753.

Almost surely, 2^{721217313031401} is an apocalyptic number.

It is an amenable number.

721217313031401 is a deficient number, since it is larger than the sum of its proper divisors (320541028013969).

721217313031401 is a wasteful number, since it uses less digits than its factorization.

721217313031401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80135257003495 (or 80135257003492 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

Adding to 721217313031401 its reverse (104130313712127), we get a palindrome (825347626743528).

The spelling of 721217313031401 in words is "seven hundred twenty-one trillion, two hundred seventeen billion, three hundred thirteen million, thirty-one thousand, four hundred one".