441621221 has 2 divisors, whose sum is σ = 441621222. Its totient is φ = 441621220.

The previous prime is 441621157. The next prime is 441621241. The reversal of 441621221 is 122126144.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 243796996 + 197824225 = 15614^2 + 14065^2 .

It is a cyclic number.

It is not a de Polignac number, because 441621221 - 2⁶ = 441621157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (441621241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220810610 + 220810611.

It is an arithmetic number, because the mean of its divisors is an integer number (220810611).

Almost surely, 2^441621221 is an apocalyptic number.

It is an amenable number.

441621221 is a deficient number, since it is larger than the sum of its proper divisors (1).

441621221 is an equidigital number, since it uses as much as digits as its factorization.

441621221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768, while the sum is 23.

The square root of 441621221 is about 21014.7857709756. The cubic root of 441621221 is about 761.5235026813.

Adding to 441621221 its reverse (122126144), we get a palindrome (563747365).

The spelling of 441621221 in words is "four hundred forty-one million, six hundred twenty-one thousand, two hundred twenty-one".