444213221 has 2 divisors, whose sum is σ = 444213222. Its totient is φ = 444213220.

The previous prime is 444213199. The next prime is 444213223. The reversal of 444213221 is 122312444.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 259660996 + 184552225 = 16114^2 + 13585^2 .

It is a cyclic number.

It is not a de Polignac number, because 444213221 - 2¹⁸ = 443951077 is a prime.

It is a super-2 number, since 2×444213221² = 394650771422389682, which contains 22 as substring.

Together with 444213223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (444213223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222106610 + 222106611.

It is an arithmetic number, because the mean of its divisors is an integer number (222106611).

Almost surely, 2^444213221 is an apocalyptic number.

It is an amenable number.

444213221 is a deficient number, since it is larger than the sum of its proper divisors (1).

444213221 is an equidigital number, since it uses as much as digits as its factorization.

444213221 is an odious number, because the sum of its binary digits is odd.

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

The square root of 444213221 is about 21076.3664088476. The cubic root of 444213221 is about 763.0104630267.

Adding to 444213221 its reverse (122312444), we get a palindrome (566525665).

The spelling of 444213221 in words is "four hundred forty-four million, two hundred thirteen thousand, two hundred twenty-one".