213023445 has 16 divisors (see below), whose sum is σ = 342169920. Its totient is φ = 113168384.

The previous prime is 213023441. The next prime is 213023471. The reversal of 213023445 is 544320312.

It is a cyclic number.

It is not a de Polignac number, because 213023445 - 2² = 213023441 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213023441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23775 + ... + 31484.

It is an arithmetic number, because the mean of its divisors is an integer number (21385620).

Almost surely, 2^213023445 is an apocalyptic number.

It is an amenable number.

213023445 is a deficient number, since it is larger than the sum of its proper divisors (129146475).

213023445 is a wasteful number, since it uses less digits than its factorization.

213023445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55524.

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 213023445 is about 14595.3227096903. The cubic root of 213023445 is about 597.2311728707.

Adding to 213023445 its reverse (544320312), we get a palindrome (757343757).

The spelling of 213023445 in words is "two hundred thirteen million, twenty-three thousand, four hundred forty-five".