21110011739857 has 2 divisors, whose sum is σ = 21110011739858. Its totient is φ = 21110011739856.

The previous prime is 21110011739851. The next prime is 21110011739881. The reversal of 21110011739857 is 75893711001112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19796457361041 + 1313554378816 = 4449321^2 + 1146104^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110011739857 - 2¹⁹ = 21110011215569 is a prime.

It is not a weakly prime, because it can be changed into another prime (21110011739851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555005869928 + 10555005869929.

It is an arithmetic number, because the mean of its divisors is an integer number (10555005869929).

Almost surely, 2^{21110011739857} is an apocalyptic number.

It is an amenable number.

21110011739857 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110011739857 is an equidigital number, since it uses as much as digits as its factorization.

21110011739857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 46.

The spelling of 21110011739857 in words is "twenty-one trillion, one hundred ten billion, eleven million, seven hundred thirty-nine thousand, eight hundred fifty-seven".