281670056760821 has 2 divisors, whose sum is σ = 281670056760822. Its totient is φ = 281670056760820.

The previous prime is 281670056760817. The next prime is 281670056760871. The reversal of 281670056760821 is 128067650076182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148508588688100 + 133161468072721 = 12186410^2 + 11539561^2 .

It is a cyclic number.

It is not a de Polignac number, because 281670056760821 - 2² = 281670056760817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281670056760871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140835028380410 + 140835028380411.

It is an arithmetic number, because the mean of its divisors is an integer number (140835028380411).

Almost surely, 2^{281670056760821} is an apocalyptic number.

It is an amenable number.

281670056760821 is a deficient number, since it is larger than the sum of its proper divisors (1).

281670056760821 is an equidigital number, since it uses as much as digits as its factorization.

281670056760821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13547520, while the sum is 59.

The spelling of 281670056760821 in words is "two hundred eighty-one trillion, six hundred seventy billion, fifty-six million, seven hundred sixty thousand, eight hundred twenty-one".