213144445 has 16 divisors (see below), whose sum is σ = 262579968. Its totient is φ = 165996160.

The previous prime is 213144443. The next prime is 213144469. The reversal of 213144445 is 544441312.

It is not a de Polignac number, because 213144445 - 2¹ = 213144443 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213144443) 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, 131832 + ... + 133438.

It is an arithmetic number, because the mean of its divisors is an integer number (16411248).

Almost surely, 2^213144445 is an apocalyptic number.

It is an amenable number.

213144445 is a deficient number, since it is larger than the sum of its proper divisors (49435523).

213144445 is a wasteful number, since it uses less digits than its factorization.

213144445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2300.

The product of its digits is 7680, while the sum is 28.

The square root of 213144445 is about 14599.4672848019. The cubic root of 213144445 is about 597.3442297438.

Adding to 213144445 its reverse (544441312), we get a palindrome (757585757).

The spelling of 213144445 in words is "two hundred thirteen million, one hundred forty-four thousand, four hundred forty-five".