320564354524221 has 4 divisors (see below), whose sum is σ = 427419139365632. Its totient is φ = 213709569682812.

The previous prime is 320564354524031. The next prime is 320564354524243. The reversal of 320564354524221 is 122425453465023.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 320564354524221 - 2¹⁰ = 320564354523197 is a prime.

It is a super-2 number, since 2×320564354524221² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320564354524621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53427392420701 + ... + 53427392420706.

It is an arithmetic number, because the mean of its divisors is an integer number (106854784841408).

Almost surely, 2^{320564354524221} is an apocalyptic number.

It is an amenable number.

320564354524221 is a deficient number, since it is larger than the sum of its proper divisors (106854784841411).

320564354524221 is a wasteful number, since it uses less digits than its factorization.

320564354524221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106854784841410.

The product of its (nonzero) digits is 6912000, while the sum is 48.

The spelling of 320564354524221 in words is "three hundred twenty trillion, five hundred sixty-four billion, three hundred fifty-four million, five hundred twenty-four thousand, two hundred twenty-one".