321100213221 has 12 divisors (see below), whose sum is σ = 463821166380. Its totient is φ = 214062310080.

The previous prime is 321100213207. The next prime is 321100213223. The reversal of 321100213221 is 122312001123.

321100213221 is a `hidden beast` number, since 321 + 1 + 0 + 0 + 21 + 322 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 47095076196 + 274005137025 = 217014^2 + 523455^2 .

It is not a de Polignac number, because 321100213221 - 2⁶ = 321100213157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 321100213194 and 321100213203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321100213223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 110185 + ... + 808913.

It is an arithmetic number, because the mean of its divisors is an integer number (38651763865).

Almost surely, 2^321100213221 is an apocalyptic number.

It is an amenable number.

321100213221 is a deficient number, since it is larger than the sum of its proper divisors (142720953159).

321100213221 is a wasteful number, since it uses less digits than its factorization.

321100213221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749796 (or 749793 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 321100213221 its reverse (122312001123), we get a palindrome (443412214344).

It can be divided in two parts, 3211002 and 13221, that added together give a palindrome (3224223).

The spelling of 321100213221 in words is "three hundred twenty-one billion, one hundred million, two hundred thirteen thousand, two hundred twenty-one".