213345561 has 16 divisors (see below), whose sum is σ = 334192320. Its totient is φ = 119353920.

The previous prime is 213345523. The next prime is 213345571. The reversal of 213345561 is 165543312.

It is not a de Polignac number, because 213345561 - 2¹¹ = 213343513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213345521) 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, 248226 + ... + 249083.

It is an arithmetic number, because the mean of its divisors is an integer number (20887020).

Almost surely, 2^213345561 is an apocalyptic number.

It is an amenable number.

213345561 is a deficient number, since it is larger than the sum of its proper divisors (120846759).

213345561 is a wasteful number, since it uses less digits than its factorization.

213345561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497336.

The product of its digits is 10800, while the sum is 30.

The square root of 213345561 is about 14606.3534463603. The cubic root of 213345561 is about 597.5320487236.

Adding to 213345561 its reverse (165543312), we get a palindrome (378888873).

The spelling of 213345561 in words is "two hundred thirteen million, three hundred forty-five thousand, five hundred sixty-one".