21073767350549 has 2 divisors, whose sum is σ = 21073767350550. Its totient is φ = 21073767350548.

The previous prime is 21073767350527. The next prime is 21073767350557. The reversal of 21073767350549 is 94505376737012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13796343921649 + 7277423428900 = 3714343^2 + 2697670^2 .

It is a cyclic number.

It is not a de Polignac number, because 21073767350549 - 2¹⁶ = 21073767285013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21073767350509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10536883675274 + 10536883675275.

It is an arithmetic number, because the mean of its divisors is an integer number (10536883675275).

Almost surely, 2^{21073767350549} is an apocalyptic number.

It is an amenable number.

21073767350549 is a deficient number, since it is larger than the sum of its proper divisors (1).

21073767350549 is an equidigital number, since it uses as much as digits as its factorization.

21073767350549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33339600, while the sum is 59.

The spelling of 21073767350549 in words is "twenty-one trillion, seventy-three billion, seven hundred sixty-seven million, three hundred fifty thousand, five hundred forty-nine".