221000331 has 8 divisors (see below), whose sum is σ = 294972624. Its totient is φ = 147180800.

The previous prime is 221000327. The next prime is 221000347. The reversal of 221000331 is 133000122.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 221000331 - 2² = 221000327 is a prime.

It is a super-2 number, since 2×221000331² = 97682292604219122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221000431) 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 7 ways as a sum of consecutive naturals, for example, 34770 + ... + 40631.

It is an arithmetic number, because the mean of its divisors is an integer number (36871578).

Almost surely, 2^221000331 is an apocalyptic number.

221000331 is a deficient number, since it is larger than the sum of its proper divisors (73972293).

221000331 is an equidigital number, since it uses as much as digits as its factorization.

221000331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76381.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 221000331 is about 14866.0798800491. The cubic root of 221000331 is about 604.5946614423.

Adding to 221000331 its reverse (133000122), we get a palindrome (354000453).

The spelling of 221000331 in words is "two hundred twenty-one million, three hundred thirty-one", and thus it is an aban number.