221213441 has 2 divisors, whose sum is σ = 221213442. Its totient is φ = 221213440.

The previous prime is 221213437. The next prime is 221213453. The reversal of 221213441 is 144312122.

221213441 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188265841 + 32947600 = 13721^2 + 5740^2 .

It is a cyclic number.

It is not a de Polignac number, because 221213441 - 2² = 221213437 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (221213411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110606720 + 110606721.

It is an arithmetic number, because the mean of its divisors is an integer number (110606721).

Almost surely, 2^221213441 is an apocalyptic number.

It is an amenable number.

221213441 is a deficient number, since it is larger than the sum of its proper divisors (1).

221213441 is an equidigital number, since it uses as much as digits as its factorization.

221213441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 20.

The square root of 221213441 is about 14873.2458125320. The cubic root of 221213441 is about 604.7889353225.

Adding to 221213441 its reverse (144312122), we get a palindrome (365525563).

The spelling of 221213441 in words is "two hundred twenty-one million, two hundred thirteen thousand, four hundred forty-one".