221332331 has 4 divisors (see below), whose sum is σ = 241453464. Its totient is φ = 201211200.

The previous prime is 221332313. The next prime is 221332361. The reversal of 221332331 is 133233122.

221332331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-221332331 is a prime.

It is a super-2 number, since 2×221332331² = 97976001491787122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221332301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10060550 + ... + 10060571.

It is an arithmetic number, because the mean of its divisors is an integer number (60363366).

Almost surely, 2^221332331 is an apocalyptic number.

221332331 is a deficient number, since it is larger than the sum of its proper divisors (20121133).

221332331 is a wasteful number, since it uses less digits than its factorization.

221332331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20121132.

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

The square root of 221332331 is about 14877.2420495198. The cubic root of 221332331 is about 604.8972627952.

Adding to 221332331 its reverse (133233122), we get a palindrome (354565453).

The spelling of 221332331 in words is "two hundred twenty-one million, three hundred thirty-two thousand, three hundred thirty-one".