320100313121221 has 4 divisors (see below), whose sum is σ = 326139941670732. Its totient is φ = 314060684571712.

The previous prime is 320100313121161. The next prime is 320100313121249. The reversal of 320100313121221 is 122121313001023.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 150344038928196 + 169756274193025 = 12261486^2 + 13029055^2 .

It is a cyclic number.

It is not a de Polignac number, because 320100313121221 - 2¹⁵ = 320100313088453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320100313121192 and 320100313121201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320100313121921) 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, 3019814274676 + ... + 3019814274781.

It is an arithmetic number, because the mean of its divisors is an integer number (81534985417683).

Almost surely, 2^{320100313121221} is an apocalyptic number.

It is an amenable number.

320100313121221 is a deficient number, since it is larger than the sum of its proper divisors (6039628549511).

320100313121221 is an equidigital number, since it uses as much as digits as its factorization.

320100313121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6039628549510.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 320100313121221 its reverse (122121313001023), we get a palindrome (442221626122244).

The spelling of 320100313121221 in words is "three hundred twenty trillion, one hundred billion, three hundred thirteen million, one hundred twenty-one thousand, two hundred twenty-one".