21554340041189 has 2 divisors, whose sum is σ = 21554340041190. Its totient is φ = 21554340041188.

The previous prime is 21554340041167. The next prime is 21554340041249. The reversal of 21554340041189 is 98114004345512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20448330252289 + 1106009788900 = 4521983^2 + 1051670^2 .

It is a cyclic number.

It is not a de Polignac number, because 21554340041189 - 2¹² = 21554340037093 is a prime.

It is a super-2 number, since 2×21554340041189² (a number of 27 digits) contains 22 as substring.

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 (21554340041159) 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, 10777170020594 + 10777170020595.

It is an arithmetic number, because the mean of its divisors is an integer number (10777170020595).

Almost surely, 2^{21554340041189} is an apocalyptic number.

It is an amenable number.

21554340041189 is a deficient number, since it is larger than the sum of its proper divisors (1).

21554340041189 is an equidigital number, since it uses as much as digits as its factorization.

21554340041189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 691200, while the sum is 47.

The spelling of 21554340041189 in words is "twenty-one trillion, five hundred fifty-four billion, three hundred forty million, forty-one thousand, one hundred eighty-nine".