247721007013 has 8 divisors (see below), whose sum is σ = 251505050328. Its totient is φ = 243964890624.

The previous prime is 247721007011. The next prime is 247721007043. The reversal of 247721007013 is 310700127742.

It can be written as a sum of positive squares in 4 ways, for example, as 30101556004 + 217619451009 = 173498^2 + 466497^2 .

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 247721007013 - 2¹ = 247721007011 is a prime.

It is a super-2 number, since 2×247721007013² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 247721007013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247721007011) 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, 6963856 + ... + 6999337.

It is an arithmetic number, because the mean of its divisors is an integer number (31438131291).

Almost surely, 2^247721007013 is an apocalyptic number.

It is an amenable number.

247721007013 is a deficient number, since it is larger than the sum of its proper divisors (3784043315).

247721007013 is a wasteful number, since it uses less digits than its factorization.

247721007013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13963463.

The product of its (nonzero) digits is 16464, while the sum is 34.

The spelling of 247721007013 in words is "two hundred forty-seven billion, seven hundred twenty-one million, seven thousand, thirteen".