321312221013 has 32 divisors (see below), whose sum is σ = 516792586240. Its totient is φ = 173469418560.

The previous prime is 321312221003. The next prime is 321312221029. The reversal of 321312221013 is 310122213123.

It is not a de Polignac number, because 321312221013 - 2¹⁶ = 321312155477 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321312221003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 950698 + ... + 1243563.

It is an arithmetic number, because the mean of its divisors is an integer number (16149768320).

Almost surely, 2^321312221013 is an apocalyptic number.

It is an amenable number.

321312221013 is a deficient number, since it is larger than the sum of its proper divisors (195480365227).

321312221013 is a wasteful number, since it uses less digits than its factorization.

321312221013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2194657.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 321312221013 its reverse (310122213123), we get a palindrome (631434434136).

The spelling of 321312221013 in words is "three hundred twenty-one billion, three hundred twelve million, two hundred twenty-one thousand, thirteen".