213612443 has 4 divisors (see below), whose sum is σ = 233031768. Its totient is φ = 194193120.

The previous prime is 213612439. The next prime is 213612457. The reversal of 213612443 is 344216312.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 213612443 - 2² = 213612439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213612403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9709646 + ... + 9709667.

It is an arithmetic number, because the mean of its divisors is an integer number (58257942).

Almost surely, 2^213612443 is an apocalyptic number.

213612443 is a deficient number, since it is larger than the sum of its proper divisors (19419325).

213612443 is a wasteful number, since it uses less digits than its factorization.

213612443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19419324.

The product of its digits is 3456, while the sum is 26.

The square root of 213612443 is about 14615.4864099694. The cubic root of 213612443 is about 597.7811033524.

Adding to 213612443 its reverse (344216312), we get a palindrome (557828755).

The spelling of 213612443 in words is "two hundred thirteen million, six hundred twelve thousand, four hundred forty-three".