441212221 has 2 divisors, whose sum is σ = 441212222. Its totient is φ = 441212220.

The previous prime is 441212209. The next prime is 441212263. The reversal of 441212221 is 122212144.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 365765625 + 75446596 = 19125^2 + 8686^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-441212221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (441512221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220606110 + 220606111.

It is an arithmetic number, because the mean of its divisors is an integer number (220606111).

Almost surely, 2^441212221 is an apocalyptic number.

It is an amenable number.

441212221 is a deficient number, since it is larger than the sum of its proper divisors (1).

441212221 is an equidigital number, since it uses as much as digits as its factorization.

441212221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 256, while the sum is 19.

The square root of 441212221 is about 21005.0522732032. The cubic root of 441212221 is about 761.2883393789.

Adding to 441212221 its reverse (122212144), we get a palindrome (563424365).

The spelling of 441212221 in words is "four hundred forty-one million, two hundred twelve thousand, two hundred twenty-one".