221423441 has 4 divisors (see below), whose sum is σ = 221464884. Its totient is φ = 221382000.

The previous prime is 221423431. The next prime is 221423459. The reversal of 221423441 is 144324122.

221423441 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 can be written as a sum of positive squares in 2 ways, for example, as 114404416 + 107019025 = 10696^2 + 10345^2 .

It is a cyclic number.

It is not a de Polignac number, because 221423441 - 2¹⁰ = 221422417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221423431) 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, 11270 + ... + 23871.

It is an arithmetic number, because the mean of its divisors is an integer number (55366221).

Almost surely, 2^221423441 is an apocalyptic number.

It is an amenable number.

221423441 is a deficient number, since it is larger than the sum of its proper divisors (41443).

221423441 is an equidigital number, since it uses as much as digits as its factorization.

221423441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41442.

The product of its digits is 1536, while the sum is 23.

The square root of 221423441 is about 14880.3037939418. The cubic root of 221423441 is about 604.9802520704.

Adding to 221423441 its reverse (144324122), we get a palindrome (365747563).

The spelling of 221423441 in words is "two hundred twenty-one million, four hundred twenty-three thousand, four hundred forty-one".