221335331 has 8 divisors (see below), whose sum is σ = 253102944. Its totient is φ = 189604800.

The previous prime is 221335273. The next prime is 221335333. The reversal of 221335331 is 133533122.

221335331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a de Polignac number, because none of the positive numbers 2^k-221335331 is a prime.

It is a super-2 number, since 2×221335331² = 97978657497759122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221335297 and 221335306.

It is not an unprimeable number, because it can be changed into a prime (221335333) 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, 4991 + ... + 21623.

It is an arithmetic number, because the mean of its divisors is an integer number (31637868).

Almost surely, 2^221335331 is an apocalyptic number.

221335331 is a deficient number, since it is larger than the sum of its proper divisors (31767613).

221335331 is a wasteful number, since it uses less digits than its factorization.

221335331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18541.

The product of its digits is 1620, while the sum is 23.

The square root of 221335331 is about 14877.3428743173. The cubic root of 221335331 is about 604.8999957648.

Adding to 221335331 its reverse (133533122), we get a palindrome (354868453).

The spelling of 221335331 in words is "two hundred twenty-one million, three hundred thirty-five thousand, three hundred thirty-one".