213301644 has 12 divisors (see below), whose sum is σ = 497703864. Its totient is φ = 71100544.

The previous prime is 213301643. The next prime is 213301663. The reversal of 213301644 is 446103312.

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

It is not an unprimeable number, because it can be changed into a prime (213301643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8887557 + ... + 8887580.

It is an arithmetic number, because the mean of its divisors is an integer number (41475322).

Almost surely, 2^213301644 is an apocalyptic number.

It is an amenable number.

213301644 is an abundant number, since it is smaller than the sum of its proper divisors (284402220).

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

213301644 is a wasteful number, since it uses less digits than its factorization.

213301644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17775144 (or 17775142 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 213301644 is about 14604.8500163473. The cubic root of 213301644 is about 597.4910454241.

Adding to 213301644 its reverse (446103312), we get a palindrome (659404956).

The spelling of 213301644 in words is "two hundred thirteen million, three hundred one thousand, six hundred forty-four".