21200210120171 has 2 divisors, whose sum is σ = 21200210120172. Its totient is φ = 21200210120170.

The previous prime is 21200210119987. The next prime is 21200210120239. The reversal of 21200210120171 is 17102101200212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21200210120171 - 2²² = 21200205925867 is a prime.

It is a super-2 number, since 2×21200210120171² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21200210126171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600105060085 + 10600105060086.

It is an arithmetic number, because the mean of its divisors is an integer number (10600105060086).

Almost surely, 2^{21200210120171} is an apocalyptic number.

21200210120171 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200210120171 is an equidigital number, since it uses as much as digits as its factorization.

21200210120171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 21200210120171 its reverse (17102101200212), we get a palindrome (38302311320383).

The spelling of 21200210120171 in words is "twenty-one trillion, two hundred billion, two hundred ten million, one hundred twenty thousand, one hundred seventy-one".