221033331 has 12 divisors (see below), whose sum is σ = 330280080. Its totient is φ = 142274160.

The previous prime is 221033299. The next prime is 221033333. The reversal of 221033331 is 133330122.

It is not a de Polignac number, because 221033331 - 2⁵ = 221033299 is a prime.

It is a super-2 number, since 2×221033331² = 97711466825911122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221033333) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 423175 + ... + 423696.

It is an arithmetic number, because the mean of its divisors is an integer number (27523340).

Almost surely, 2^221033331 is an apocalyptic number.

221033331 is a deficient number, since it is larger than the sum of its proper divisors (109246749).

221033331 is a wasteful number, since it uses less digits than its factorization.

221033331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846906 (or 846903 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

The square root of 221033331 is about 14867.1897478979. The cubic root of 221033331 is about 604.6247528465.

Adding to 221033331 its reverse (133330122), we get a palindrome (354363453).

The spelling of 221033331 in words is "two hundred twenty-one million, thirty-three thousand, three hundred thirty-one".