1721224893769 has 2 divisors, whose sum is σ = 1721224893770. Its totient is φ = 1721224893768.

The previous prime is 1721224893721. The next prime is 1721224893803. The reversal of 1721224893769 is 9673984221271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1440576057600 + 280648836169 = 1200240^2 + 529763^2 .

It is a cyclic number.

It is not a de Polignac number, because 1721224893769 - 2¹⁵ = 1721224861001 is a prime.

It is a super-2 number, since 2×1721224893769² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1721224893719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860612446884 + 860612446885.

It is an arithmetic number, because the mean of its divisors is an integer number (860612446885).

Almost surely, 2^{1721224893769} is an apocalyptic number.

It is an amenable number.

1721224893769 is a deficient number, since it is larger than the sum of its proper divisors (1).

1721224893769 is an equidigital number, since it uses as much as digits as its factorization.

1721224893769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18289152, while the sum is 61.

The spelling of 1721224893769 in words is "one trillion, seven hundred twenty-one billion, two hundred twenty-four million, eight hundred ninety-three thousand, seven hundred sixty-nine".