221738041853 has 2 divisors, whose sum is σ = 221738041854. Its totient is φ = 221738041852.

The previous prime is 221738041793. The next prime is 221738041901. The reversal of 221738041853 is 358140837122.

221738041853 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., 195295054084 + 26442987769 = 441922^2 + 162613^2 .

It is a cyclic number.

It is not a de Polignac number, because 221738041853 - 2²⁴ = 221721264637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221738041153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110869020926 + 110869020927.

It is an arithmetic number, because the mean of its divisors is an integer number (110869020927).

Almost surely, 2^221738041853 is an apocalyptic number.

It is an amenable number.

221738041853 is a deficient number, since it is larger than the sum of its proper divisors (1).

221738041853 is an equidigital number, since it uses as much as digits as its factorization.

221738041853 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 322560, while the sum is 44.

Adding to 221738041853 its reverse (358140837122), we get a palindrome (579878878975).

The spelling of 221738041853 in words is "two hundred twenty-one billion, seven hundred thirty-eight million, forty-one thousand, eight hundred fifty-three".