212321221 has 8 divisors (see below), whose sum is σ = 245577024. Its totient is φ = 179796480.

The previous prime is 212321203. The next prime is 212321261. The reversal of 212321221 is 122123212.

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 212321221 - 2⁵ = 212321189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212321195 and 212321204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212321261) 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, 182140 + ... + 183301.

It is an arithmetic number, because the mean of its divisors is an integer number (30697128).

Almost surely, 2^212321221 is an apocalyptic number.

It is an amenable number.

212321221 is a deficient number, since it is larger than the sum of its proper divisors (33255803).

212321221 is an equidigital number, since it uses as much as digits as its factorization.

212321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365531.

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

The square root of 212321221 is about 14571.2463777125. The cubic root of 212321221 is about 596.5742002017.

Adding to 212321221 its reverse (122123212), we get a palindrome (334444433).

The spelling of 212321221 in words is "two hundred twelve million, three hundred twenty-one thousand, two hundred twenty-one".