213420444 has 12 divisors (see below), whose sum is σ = 497981064. Its totient is φ = 71140144.

The previous prime is 213420439. The next prime is 213420469. The reversal of 213420444 is 444024312.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 8892507 + ... + 8892530.

It is an arithmetic number, because the mean of its divisors is an integer number (41498422).

Almost surely, 2^213420444 is an apocalyptic number.

It is an amenable number.

213420444 is an abundant number, since it is smaller than the sum of its proper divisors (284560620).

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

213420444 is a wasteful number, since it uses less digits than its factorization.

213420444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17785044 (or 17785042 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 213420444 is about 14608.9165922734. The cubic root of 213420444 is about 597.6019505894.

Adding to 213420444 its reverse (444024312), we get a palindrome (657444756).

It can be divided in two parts, 2134 and 20444, that added together give a triangular number (22578 = T₂₁₂).

The spelling of 213420444 in words is "two hundred thirteen million, four hundred twenty thousand, four hundred forty-four".