321221012113 has 4 divisors (see below), whose sum is σ = 321419175988. Its totient is φ = 321022848240.

The previous prime is 321221012107. The next prime is 321221012129. The reversal of 321221012113 is 311210122123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 311210122123 = 809 ⋅384684947.

It can be written as a sum of positive squares in 2 ways, for example, as 301206685329 + 20014326784 = 548823^2 + 141472^2 .

It is a cyclic number.

It is not a de Polignac number, because 321221012113 - 2⁵ = 321221012081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321221012143) 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, 99079506 + ... + 99082747.

It is an arithmetic number, because the mean of its divisors is an integer number (80354793997).

Almost surely, 2^321221012113 is an apocalyptic number.

It is an amenable number.

321221012113 is a deficient number, since it is larger than the sum of its proper divisors (198163875).

321221012113 is a wasteful number, since it uses less digits than its factorization.

321221012113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198163874.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 321221012113 its reverse (311210122123), we get a palindrome (632431134236).

The spelling of 321221012113 in words is "three hundred twenty-one billion, two hundred twenty-one million, twelve thousand, one hundred thirteen".