1277043705221 has 2 divisors, whose sum is σ = 1277043705222. Its totient is φ = 1277043705220.

The previous prime is 1277043705173. The next prime is 1277043705239. The reversal of 1277043705221 is 1225073407721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 718279980196 + 558763725025 = 847514^2 + 747505^2 .

It is a cyclic number.

It is not a de Polignac number, because 1277043705221 - 2¹⁰ = 1277043704197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1277043707221) 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, 638521852610 + 638521852611.

It is an arithmetic number, because the mean of its divisors is an integer number (638521852611).

Almost surely, 2^{1277043705221} is an apocalyptic number.

It is an amenable number.

1277043705221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1277043705221 is an equidigital number, since it uses as much as digits as its factorization.

1277043705221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 164640, while the sum is 41.

The spelling of 1277043705221 in words is "one trillion, two hundred seventy-seven billion, forty-three million, seven hundred five thousand, two hundred twenty-one".