221443413 has 8 divisors (see below), whose sum is σ = 295719648. Its totient is φ = 147398064.

The previous prime is 221443403. The next prime is 221443427. The reversal of 221443413 is 314344122.

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

It is a de Polignac number, because none of the positive numbers 2^k-221443413 is a prime.

It is a super-2 number, since 2×221443413² = 98074370322177138, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221443403) 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, 55470 + ... + 59327.

It is an arithmetic number, because the mean of its divisors is an integer number (36964956).

Almost surely, 2^221443413 is an apocalyptic number.

It is an amenable number.

221443413 is a deficient number, since it is larger than the sum of its proper divisors (74276235).

221443413 is a wasteful number, since it uses less digits than its factorization.

221443413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115443.

The product of its digits is 2304, while the sum is 24.

The square root of 221443413 is about 14880.9748672592. The cubic root of 221443413 is about 604.9984409039.

Adding to 221443413 its reverse (314344122), we get a palindrome (535787535).

The spelling of 221443413 in words is "two hundred twenty-one million, four hundred forty-three thousand, four hundred thirteen".