21163944917741 has 2 divisors, whose sum is σ = 21163944917742. Its totient is φ = 21163944917740.

The previous prime is 21163944917683. The next prime is 21163944917821. The reversal of 21163944917741 is 14771944936112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21162484072900 + 1460844841 = 4600270^2 + 38221^2 .

It is a cyclic number.

It is not a de Polignac number, because 21163944917741 - 2¹⁰ = 21163944916717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21163944917341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10581972458870 + 10581972458871.

It is an arithmetic number, because the mean of its divisors is an integer number (10581972458871).

Almost surely, 2^{21163944917741} is an apocalyptic number.

It is an amenable number.

21163944917741 is a deficient number, since it is larger than the sum of its proper divisors (1).

21163944917741 is an equidigital number, since it uses as much as digits as its factorization.

21163944917741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9144576, while the sum is 59.

The spelling of 21163944917741 in words is "twenty-one trillion, one hundred sixty-three billion, nine hundred forty-four million, nine hundred seventeen thousand, seven hundred forty-one".