721126754313 has 24 divisors (see below), whose sum is σ = 1118522715552. Its totient is φ = 412057545984.

The previous prime is 721126754311. The next prime is 721126754321. The reversal of 721126754313 is 313457621127.

It is not a de Polignac number, because 721126754313 - 2¹ = 721126754311 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (721126754311) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4976106 + ... + 5118972.

It is an arithmetic number, because the mean of its divisors is an integer number (46605113148).

Almost surely, 2^721126754313 is an apocalyptic number.

It is an amenable number.

721126754313 is a deficient number, since it is larger than the sum of its proper divisors (397395961239).

721126754313 is a wasteful number, since it uses less digits than its factorization.

721126754313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177221 (or 177214 counting only the distinct ones).

The product of its digits is 211680, while the sum is 42.

The spelling of 721126754313 in words is "seven hundred twenty-one billion, one hundred twenty-six million, seven hundred fifty-four thousand, three hundred thirteen".