213444645 has 16 divisors (see below), whose sum is σ = 341710080. Its totient is φ = 113770944.

The previous prime is 213444643. The next prime is 213444677. The reversal of 213444645 is 546444312.

It is a happy number.

It is not a de Polignac number, because 213444645 - 2¹ = 213444643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213444643) 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, 33636 + ... + 39474.

It is an arithmetic number, because the mean of its divisors is an integer number (21356880).

Almost surely, 2^213444645 is an apocalyptic number.

It is an amenable number.

213444645 is a deficient number, since it is larger than the sum of its proper divisors (128265435).

213444645 is a wasteful number, since it uses less digits than its factorization.

213444645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8284.

The product of its digits is 46080, while the sum is 33.

The square root of 213444645 is about 14609.7448643020. The cubic root of 213444645 is about 597.6245382696.

Adding to 213444645 its reverse (546444312), we get a palindrome (759888957).

The spelling of 213444645 in words is "two hundred thirteen million, four hundred forty-four thousand, six hundred forty-five".