7120666557221 has 16 divisors (see below), whose sum is σ = 8172696954240. Its totient is φ = 6077348352000.

The previous prime is 7120666557209. The next prime is 7120666557287. The reversal of 7120666557221 is 1227556660217.

It is a cyclic number.

It is not a de Polignac number, because 7120666557221 - 2¹⁰ = 7120666556197 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7120666557221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7120665557221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5487785 + ... + 6660113.

It is an arithmetic number, because the mean of its divisors is an integer number (510793559640).

Almost surely, 2^{7120666557221} is an apocalyptic number.

It is an amenable number.

7120666557221 is a deficient number, since it is larger than the sum of its proper divisors (1052030397019).

7120666557221 is a wasteful number, since it uses less digits than its factorization.

7120666557221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1176044.

The product of its (nonzero) digits is 2116800, while the sum is 50.

The spelling of 7120666557221 in words is "seven trillion, one hundred twenty billion, six hundred sixty-six million, five hundred fifty-seven thousand, two hundred twenty-one".