221323331 has 8 divisors (see below), whose sum is σ = 231530400. Its totient is φ = 211288000.

The previous prime is 221323313. The next prime is 221323339. The reversal of 221323331 is 133323122.

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 221323331 - 2¹⁴ = 221306947 is a prime.

It is a super-2 number, since 2×221323331² = 97968033689871122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221323339) 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, 40295 + ... + 45456.

It is an arithmetic number, because the mean of its divisors is an integer number (28941300).

Almost surely, 2^221323331 is an apocalyptic number.

221323331 is a deficient number, since it is larger than the sum of its proper divisors (10207069).

221323331 is an equidigital number, since it uses as much as digits as its factorization.

221323331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85869.

The product of its digits is 648, while the sum is 20.

The square root of 221323331 is about 14876.9395710274. The cubic root of 221323331 is about 604.8890637383.

Adding to 221323331 its reverse (133323122), we get a palindrome (354646453).

The spelling of 221323331 in words is "two hundred twenty-one million, three hundred twenty-three thousand, three hundred thirty-one".