213123210 has 16 divisors (see below), whose sum is σ = 511495776. Its totient is φ = 56832848.

The previous prime is 213123199. The next prime is 213123217. The reversal of 213123210 is 12321312.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 213123210.

It is not an unprimeable number, because it can be changed into a prime (213123217) 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, 3552024 + ... + 3552083.

It is an arithmetic number, because the mean of its divisors is an integer number (31968486).

Almost surely, 2^213123210 is an apocalyptic number.

213123210 is an abundant number, since it is smaller than the sum of its proper divisors (298372566).

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

213123210 is a wasteful number, since it uses less digits than its factorization.

213123210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7104117.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 213123210 is about 14598.7400141245. The cubic root of 213123210 is about 597.3243918259.

Adding to 213123210 its reverse (12321312), we get a palindrome (225444522).

The spelling of 213123210 in words is "two hundred thirteen million, one hundred twenty-three thousand, two hundred ten".