213444220433 has 4 divisors (see below), whose sum is σ = 214678002228. Its totient is φ = 212210438640.

The previous prime is 213444220417. The next prime is 213444220439. The reversal of 213444220433 is 334022444312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 190106464144 + 23337756289 = 436012^2 + 152767^2 .

It is a cyclic number.

It is not a de Polignac number, because 213444220433 - 2⁴ = 213444220417 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213444220433.

It is not an unprimeable number, because it can be changed into a prime (213444220439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 616890638 + ... + 616890983.

It is an arithmetic number, because the mean of its divisors is an integer number (53669500557).

Almost surely, 2^213444220433 is an apocalyptic number.

It is an amenable number.

213444220433 is a deficient number, since it is larger than the sum of its proper divisors (1233781795).

213444220433 is a wasteful number, since it uses less digits than its factorization.

213444220433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233781794.

The product of its (nonzero) digits is 55296, while the sum is 32.

Adding to 213444220433 its reverse (334022444312), we get a palindrome (547466664745).

The spelling of 213444220433 in words is "two hundred thirteen billion, four hundred forty-four million, two hundred twenty thousand, four hundred thirty-three".