221544622544101 has 2 divisors, whose sum is σ = 221544622544102. Its totient is φ = 221544622544100.

The previous prime is 221544622544033. The next prime is 221544622544117. The reversal of 221544622544101 is 101445226445122.

221544622544101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189426389927076 + 32118232617025 = 13763226^2 + 5667295^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221544622544101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221544622524101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110772311272050 + 110772311272051.

It is an arithmetic number, because the mean of its divisors is an integer number (110772311272051).

Almost surely, 2^{221544622544101} is an apocalyptic number.

It is an amenable number.

221544622544101 is a deficient number, since it is larger than the sum of its proper divisors (1).

221544622544101 is an equidigital number, since it uses as much as digits as its factorization.

221544622544101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 614400, while the sum is 43.

Adding to 221544622544101 its reverse (101445226445122), we get a palindrome (322989848989223).

The spelling of 221544622544101 in words is "two hundred twenty-one trillion, five hundred forty-four billion, six hundred twenty-two million, five hundred forty-four thousand, one hundred one".