321213312121 has 16 divisors (see below), whose sum is σ = 366289611408. Its totient is φ = 279048499200.

The previous prime is 321213312023. The next prime is 321213312187. The reversal of 321213312121 is 121213312123.

It can be written as a sum of positive squares in 8 ways, for example, as 36735088896 + 284478223225 = 191664^2 + 533365^2 .

It is not a de Polignac number, because 321213312121 - 2⁹ = 321213311609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321213312092 and 321213312101.

It is not an unprimeable number, because it can be changed into a prime (321213312421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8095551 + ... + 8135131.

It is an arithmetic number, because the mean of its divisors is an integer number (22893100713).

Almost surely, 2^321213312121 is an apocalyptic number.

It is an amenable number.

321213312121 is a deficient number, since it is larger than the sum of its proper divisors (45076299287).

321213312121 is a wasteful number, since it uses less digits than its factorization.

321213312121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76332.

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

Adding to 321213312121 its reverse (121213312123), we get a palindrome (442426624244).

The spelling of 321213312121 in words is "three hundred twenty-one billion, two hundred thirteen million, three hundred twelve thousand, one hundred twenty-one".