21170741093 has 2 divisors, whose sum is σ = 21170741094. Its totient is φ = 21170741092.

The previous prime is 21170741057. The next prime is 21170741107. The reversal of 21170741093 is 39014707112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18907075009 + 2263666084 = 137503^2 + 47578^2 .

It is a cyclic number.

It is not a de Polignac number, because 21170741093 - 2⁶ = 21170741029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21170741593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10585370546 + 10585370547.

It is an arithmetic number, because the mean of its divisors is an integer number (10585370547).

Almost surely, 2^21170741093 is an apocalyptic number.

It is an amenable number.

21170741093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21170741093 is an equidigital number, since it uses as much as digits as its factorization.

21170741093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 35.

The spelling of 21170741093 in words is "twenty-one billion, one hundred seventy million, seven hundred forty-one thousand, ninety-three".