320657070221 has 4 divisors (see below), whose sum is σ = 322318506012. Its totient is φ = 318995634432.

The previous prime is 320657070199. The next prime is 320657070241. The reversal of 320657070221 is 122070756023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122070756023 = 157 ⋅777520739.

It can be written as a sum of positive squares in 2 ways, for example, as 145836916996 + 174820153225 = 381886^2 + 418115^2 .

It is a cyclic number.

It is not a de Polignac number, because 320657070221 - 2³⁸ = 45779163277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320657070241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 830717606 + ... + 830717991.

It is an arithmetic number, because the mean of its divisors is an integer number (80579626503).

Almost surely, 2^320657070221 is an apocalyptic number.

It is an amenable number.

320657070221 is a deficient number, since it is larger than the sum of its proper divisors (1661435791).

320657070221 is a wasteful number, since it uses less digits than its factorization.

320657070221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1661435790.

The product of its (nonzero) digits is 35280, while the sum is 35.

The spelling of 320657070221 in words is "three hundred twenty billion, six hundred fifty-seven million, seventy thousand, two hundred twenty-one".