21977641273733 has 2 divisors, whose sum is σ = 21977641273734. Its totient is φ = 21977641273732.

The previous prime is 21977641273723. The next prime is 21977641273759. The reversal of 21977641273733 is 33737214677912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17945585305729 + 4032055968004 = 4236223^2 + 2007998^2 .

It is a cyclic number.

It is not a de Polignac number, because 21977641273733 - 2²⁰ = 21977640225157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21977641273723) 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, 10988820636866 + 10988820636867.

It is an arithmetic number, because the mean of its divisors is an integer number (10988820636867).

Almost surely, 2^{21977641273733} is an apocalyptic number.

It is an amenable number.

21977641273733 is a deficient number, since it is larger than the sum of its proper divisors (1).

21977641273733 is an equidigital number, since it uses as much as digits as its factorization.

21977641273733 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56010528, while the sum is 62.

The spelling of 21977641273733 in words is "twenty-one trillion, nine hundred seventy-seven billion, six hundred forty-one million, two hundred seventy-three thousand, seven hundred thirty-three".