221325331 has 4 divisors (see below), whose sum is σ = 221358312. Its totient is φ = 221292352.

The previous prime is 221325317. The next prime is 221325353. The reversal of 221325331 is 133523122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221325331 is a prime.

It is a super-2 number, since 2×221325331² = 97969804284519122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221325371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2425 + ... + 21178.

It is an arithmetic number, because the mean of its divisors is an integer number (55339578).

Almost surely, 2^221325331 is an apocalyptic number.

221325331 is a deficient number, since it is larger than the sum of its proper divisors (32981).

221325331 is an equidigital number, since it uses as much as digits as its factorization.

221325331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32980.

The product of its digits is 1080, while the sum is 22.

The square root of 221325331 is about 14877.0067890016. The cubic root of 221325331 is about 604.8908857702.

Adding to 221325331 its reverse (133523122), we get a palindrome (354848453).

The spelling of 221325331 in words is "two hundred twenty-one million, three hundred twenty-five thousand, three hundred thirty-one".