7212721667205 has 32 divisors (see below), whose sum is σ = 11644633238400. Its totient is φ = 3812037949440.

The previous prime is 7212721667171. The next prime is 7212721667219. The reversal of 7212721667205 is 5027661272127.

It is a happy number.

It is not a de Polignac number, because 7212721667205 - 2¹¹ = 7212721665157 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8845590 + ... + 9626520.

It is an arithmetic number, because the mean of its divisors is an integer number (363894788700).

Almost surely, 2^{7212721667205} is an apocalyptic number.

It is an amenable number.

7212721667205 is a deficient number, since it is larger than the sum of its proper divisors (4431911571195).

7212721667205 is a wasteful number, since it uses less digits than its factorization.

7212721667205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786501.

The product of its (nonzero) digits is 987840, while the sum is 48.

The spelling of 7212721667205 in words is "seven trillion, two hundred twelve billion, seven hundred twenty-one million, six hundred sixty-seven thousand, two hundred five".