213040445 has 32 divisors (see below), whose sum is σ = 276480000. Its totient is φ = 157101120.

The previous prime is 213040441. The next prime is 213040459. The reversal of 213040445 is 544040312.

It is not a de Polignac number, because 213040445 - 2² = 213040441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213040445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213040441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1070456 + ... + 1070654.

It is an arithmetic number, because the mean of its divisors is an integer number (8640000).

Almost surely, 2^213040445 is an apocalyptic number.

It is an amenable number.

213040445 is a deficient number, since it is larger than the sum of its proper divisors (63439555).

213040445 is a wasteful number, since it uses less digits than its factorization.

213040445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 213040445 is about 14595.9050764247. The cubic root of 213040445 is about 597.2470594786.

Adding to 213040445 its reverse (544040312), we get a palindrome (757080757).

The spelling of 213040445 in words is "two hundred thirteen million, forty thousand, four hundred forty-five".