213321204 has 36 divisors (see below), whose sum is σ = 546829920. Its totient is φ = 70104720.

The previous prime is 213321181. The next prime is 213321223. The reversal of 213321204 is 402123312.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39174 + ... + 44285.

It is an arithmetic number, because the mean of its divisors is an integer number (15189720).

Almost surely, 2^213321204 is an apocalyptic number.

It is an amenable number.

213321204 is an abundant number, since it is smaller than the sum of its proper divisors (333508716).

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

213321204 is a wasteful number, since it uses less digits than its factorization.

213321204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83540 (or 83535 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 213321204 is about 14605.5196415602. The cubic root of 213321204 is about 597.5093083988.

Adding to 213321204 its reverse (402123312), we get a palindrome (615444516).

The spelling of 213321204 in words is "two hundred thirteen million, three hundred twenty-one thousand, two hundred four".