321212221 has 8 divisors (see below), whose sum is σ = 351779904. Its totient is φ = 290872320.

The previous prime is 321212197. The next prime is 321212231. The reversal of 321212221 is 122212123.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 321212221 - 2¹⁹ = 320687933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321212195 and 321212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321212231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53985 + ... + 59638.

It is an arithmetic number, because the mean of its divisors is an integer number (43972488).

Almost surely, 2^321212221 is an apocalyptic number.

It is an amenable number.

321212221 is a deficient number, since it is larger than the sum of its proper divisors (30567683).

321212221 is a wasteful number, since it uses less digits than its factorization.

321212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113891.

The product of its digits is 96, while the sum is 16.

The square root of 321212221 is about 17922.3943991867. The cubic root of 321212221 is about 684.8529856593.

Adding to 321212221 its reverse (122212123), we get a palindrome (443424344).

The spelling of 321212221 in words is "three hundred twenty-one million, two hundred twelve thousand, two hundred twenty-one".