213242004 has 48 divisors (see below), whose sum is σ = 554178240. Its totient is φ = 70909920.

The previous prime is 213241981. The next prime is 213242009. The reversal of 213242004 is 400242312.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213242009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47647 + ... + 51929.

It is an arithmetic number, because the mean of its divisors is an integer number (11545380).

Almost surely, 2^213242004 is an apocalyptic number.

It is an amenable number.

213242004 is an abundant number, since it is smaller than the sum of its proper divisors (340936236).

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

213242004 is a wasteful number, since it uses less digits than its factorization.

213242004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4757 (or 4749 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 213242004 is about 14602.8080861182. The cubic root of 213242004 is about 597.4353532644.

Adding to 213242004 its reverse (400242312), we get a palindrome (613484316).

The spelling of 213242004 in words is "two hundred thirteen million, two hundred forty-two thousand, four".