221213443 has 8 divisors (see below), whose sum is σ = 246458880. Its totient is φ = 196823880.

The previous prime is 221213441. The next prime is 221213453. The reversal of 221213443 is 344312122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221213443 - 2¹ = 221213441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221213441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213423 + ... + 214456.

It is an arithmetic number, because the mean of its divisors is an integer number (30807360).

Almost surely, 2^221213443 is an apocalyptic number.

221213443 is a deficient number, since it is larger than the sum of its proper divisors (25245437).

221213443 is a wasteful number, since it uses less digits than its factorization.

221213443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427937.

The product of its digits is 1152, while the sum is 22.

The square root of 221213443 is about 14873.2458797668. The cubic root of 221213443 is about 604.7889371451.

Adding to 221213443 its reverse (344312122), we get a palindrome (565525565).

The spelling of 221213443 in words is "two hundred twenty-one million, two hundred thirteen thousand, four hundred forty-three".