221143331 has 4 divisors (see below), whose sum is σ = 221352432. Its totient is φ = 220934232.

The previous prime is 221143313. The next prime is 221143333. The reversal of 221143331 is 133341122.

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

It is a cyclic number.

It is not a de Polignac number, because 221143331 - 2¹⁴ = 221126947 is a prime.

It is a super-2 number, since 2×221143331² = 97808745691551122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221143333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102956 + ... + 105081.

It is an arithmetic number, because the mean of its divisors is an integer number (55338108).

Almost surely, 2^221143331 is an apocalyptic number.

221143331 is a deficient number, since it is larger than the sum of its proper divisors (209101).

221143331 is a wasteful number, since it uses less digits than its factorization.

221143331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209100.

The product of its digits is 432, while the sum is 20.

The square root of 221143331 is about 14870.8887091525. Note that the first 3 decimals coincide. The cubic root of 221143331 is about 604.7250359012.

Adding to 221143331 its reverse (133341122), we get a palindrome (354484453).

The spelling of 221143331 in words is "two hundred twenty-one million, one hundred forty-three thousand, three hundred thirty-one".