21169171139 has 2 divisors, whose sum is σ = 21169171140. Its totient is φ = 21169171138.

The previous prime is 21169171129. The next prime is 21169171217. The reversal of 21169171139 is 93117196112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21169171139 - 2¹² = 21169167043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21169171096 and 21169171105.

It is not a weakly prime, because it can be changed into another prime (21169171109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10584585569 + 10584585570.

It is an arithmetic number, because the mean of its divisors is an integer number (10584585570).

Almost surely, 2^21169171139 is an apocalyptic number.

21169171139 is a deficient number, since it is larger than the sum of its proper divisors (1).

21169171139 is an equidigital number, since it uses as much as digits as its factorization.

21169171139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412, while the sum is 41.

The spelling of 21169171139 in words is "twenty-one billion, one hundred sixty-nine million, one hundred seventy-one thousand, one hundred thirty-nine".