221011223431541 has 2 divisors, whose sum is σ = 221011223431542. Its totient is φ = 221011223431540.

The previous prime is 221011223431351. The next prime is 221011223431547. The reversal of 221011223431541 is 145134322110122.

221011223431541 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., 194913122954641 + 26098100476900 = 13961129^2 + 5108630^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221011223431541 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221011223431498 and 221011223431507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221011223431547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110505611715770 + 110505611715771.

It is an arithmetic number, because the mean of its divisors is an integer number (110505611715771).

Almost surely, 2^{221011223431541} is an apocalyptic number.

It is an amenable number.

221011223431541 is a deficient number, since it is larger than the sum of its proper divisors (1).

221011223431541 is an equidigital number, since it uses as much as digits as its factorization.

221011223431541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 32.

Adding to 221011223431541 its reverse (145134322110122), we get a palindrome (366145545541663).

The spelling of 221011223431541 in words is "two hundred twenty-one trillion, eleven billion, two hundred twenty-three million, four hundred thirty-one thousand, five hundred forty-one".