213221204 has 12 divisors (see below), whose sum is σ = 426442464. Its totient is φ = 91380504.

The previous prime is 213221171. The next prime is 213221209. The reversal of 213221204 is 402122312.

213221204 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213221209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3807494 + ... + 3807549.

It is an arithmetic number, because the mean of its divisors is an integer number (35536872).

Almost surely, 2^213221204 is an apocalyptic number.

It is an amenable number.

213221204 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213221204 is a wasteful number, since it uses less digits than its factorization.

213221204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7615054 (or 7615052 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 213221204 is about 14602.0958769623. The cubic root of 213221204 is about 597.4159276679.

Adding to 213221204 its reverse (402122312), we get a palindrome (615343516).

The spelling of 213221204 in words is "two hundred thirteen million, two hundred twenty-one thousand, two hundred four".