221441331 has 4 divisors (see below), whose sum is σ = 295255112. Its totient is φ = 147627552.

The previous prime is 221441237. The next prime is 221441377. The reversal of 221441331 is 133144122.

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

It is not a de Polignac number, because 221441331 - 2¹³ = 221433139 is a prime.

It is a super-2 number, since 2×221441331² = 98072526150103122, 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 = 221441298 and 221441307.

It is not an unprimeable number, because it can be changed into a prime (221441131) 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, 36906886 + ... + 36906891.

It is an arithmetic number, because the mean of its divisors is an integer number (73813778).

Almost surely, 2^221441331 is an apocalyptic number.

221441331 is a deficient number, since it is larger than the sum of its proper divisors (73813781).

221441331 is an equidigital number, since it uses as much as digits as its factorization.

221441331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73813780.

The product of its digits is 576, while the sum is 21.

The square root of 221441331 is about 14880.9049120005. The cubic root of 221441331 is about 604.9965448429.

Adding to 221441331 its reverse (133144122), we get a palindrome (354585453).

The spelling of 221441331 in words is "two hundred twenty-one million, four hundred forty-one thousand, three hundred thirty-one".