7221312605205 has 32 divisors (see below), whose sum is σ = 12951498741120. Its totient is φ = 3817283823360.

The previous prime is 7221312605203. The next prime is 7221312605249. The reversal of 7221312605205 is 5025062131227.

7221312605205 is a `hidden beast` number, since 7 + 2 + 2 + 1 + 3 + 126 + 0 + 520 + 5 = 666.

It is not a de Polignac number, because 7221312605205 - 2¹ = 7221312605203 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7221312605205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7221312605203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 236671491 + ... + 236702000.

It is an arithmetic number, because the mean of its divisors is an integer number (404734335660).

Almost surely, 2^{7221312605205} is an apocalyptic number.

It is an amenable number.

7221312605205 is a deficient number, since it is larger than the sum of its proper divisors (5730186135915).

7221312605205 is a wasteful number, since it uses less digits than its factorization.

7221312605205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473373618 (or 473373612 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The spelling of 7221312605205 in words is "seven trillion, two hundred twenty-one billion, three hundred twelve million, six hundred five thousand, two hundred five".