1220344404221 has 2 divisors, whose sum is σ = 1220344404222. Its totient is φ = 1220344404220.

The previous prime is 1220344404217. The next prime is 1220344404241. The reversal of 1220344404221 is 1224044430221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 992324784025 + 228019620196 = 996155^2 + 477514^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220344404221 - 2² = 1220344404217 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220344404241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610172202110 + 610172202111.

It is an arithmetic number, because the mean of its divisors is an integer number (610172202111).

Almost surely, 2^{1220344404221} is an apocalyptic number.

It is an amenable number.

1220344404221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220344404221 is an equidigital number, since it uses as much as digits as its factorization.

1220344404221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 1220344404221 its reverse (1224044430221), we get a palindrome (2444388834442).

The spelling of 1220344404221 in words is "one trillion, two hundred twenty billion, three hundred forty-four million, four hundred four thousand, two hundred twenty-one".