213044004 has 36 divisors (see below), whose sum is σ = 538970796. Its totient is φ = 70956288.

The previous prime is 213043993. The next prime is 213044011. The reversal of 213044004 is 400440312.

It can be written as a sum of positive squares in 2 ways, for example, as 66585600 + 146458404 = 8160^2 + 12102^2 .

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 an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 84912 + ... + 87384.

It is an arithmetic number, because the mean of its divisors is an integer number (14971411).

Almost surely, 2^213044004 is an apocalyptic number.

It is an amenable number.

213044004 is an abundant number, since it is smaller than the sum of its proper divisors (325926792).

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

213044004 is a wasteful number, since it uses less digits than its factorization.

213044004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4876 (or 4871 counting only the distinct ones).

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

The square root of 213044004 is about 14596.0269936719. The cubic root of 213044004 is about 597.2503852798.

Adding to 213044004 its reverse (400440312), we get a palindrome (613484316).

The spelling of 213044004 in words is "two hundred thirteen million, forty-four thousand, four".