213204243 has 24 divisors (see below), whose sum is σ = 331315920. Its totient is φ = 121598400.

The previous prime is 213204221. The next prime is 213204247. The reversal of 213204243 is 342402312.

It is not a de Polignac number, because 213204243 - 2⁶ = 213204179 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (213204247) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 102013 + ... + 104081.

It is an arithmetic number, because the mean of its divisors is an integer number (13804830).

Almost surely, 2^213204243 is an apocalyptic number.

213204243 is a deficient number, since it is larger than the sum of its proper divisors (118111677).

213204243 is a wasteful number, since it uses less digits than its factorization.

213204243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2787 (or 2780 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 213204243 is about 14601.5150926197. The cubic root of 213204243 is about 597.4000864663.

Adding to 213204243 its reverse (342402312), we get a palindrome (555606555).

The spelling of 213204243 in words is "two hundred thirteen million, two hundred four thousand, two hundred forty-three".