323130211223221 has 4 divisors (see below), whose sum is σ = 331011435887244. Its totient is φ = 315248986559200.

The previous prime is 323130211223213. The next prime is 323130211223321. The reversal of 323130211223221 is 122322112031323.

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 19285395212196 + 303844816011025 = 4391514^2 + 17431145^2 .

It is a cyclic number.

It is not a de Polignac number, because 323130211223221 - 2³ = 323130211223213 is a prime.

It is a super-2 number, since 2×323130211223221² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 323130211223221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (323130211223201) 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, 3940612331950 + ... + 3940612332031.

It is an arithmetic number, because the mean of its divisors is an integer number (82752858971811).

Almost surely, 2^{323130211223221} is an apocalyptic number.

It is an amenable number.

323130211223221 is a deficient number, since it is larger than the sum of its proper divisors (7881224664023).

323130211223221 is an equidigital number, since it uses as much as digits as its factorization.

323130211223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7881224664022.

The product of its (nonzero) digits is 5184, while the sum is 28.

Adding to 323130211223221 its reverse (122322112031323), we get a palindrome (445452323254544).

The spelling of 323130211223221 in words is "three hundred twenty-three trillion, one hundred thirty billion, two hundred eleven million, two hundred twenty-three thousand, two hundred twenty-one".