1105873815721 has 2 divisors, whose sum is σ = 1105873815722. Its totient is φ = 1105873815720.

The previous prime is 1105873815701. The next prime is 1105873815751. The reversal of 1105873815721 is 1275183785011.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 694120593321 + 411753222400 = 833139^2 + 641680^2 .

It is a cyclic number.

It is not a de Polignac number, because 1105873815721 - 2¹¹ = 1105873813673 is a prime.

It is not a weakly prime, because it can be changed into another prime (1105873815701) 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, 552936907860 + 552936907861.

It is an arithmetic number, because the mean of its divisors is an integer number (552936907861).

Almost surely, 2^{1105873815721} is an apocalyptic number.

It is an amenable number.

1105873815721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1105873815721 is an equidigital number, since it uses as much as digits as its factorization.

1105873815721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 470400, while the sum is 49.

The spelling of 1105873815721 in words is "one trillion, one hundred five billion, eight hundred seventy-three million, eight hundred fifteen thousand, seven hundred twenty-one".