21200220112171 has 2 divisors, whose sum is σ = 21200220112172. Its totient is φ = 21200220112170.

The previous prime is 21200220112091. The next prime is 21200220112177. The reversal of 21200220112171 is 17121102200212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21200220112171 - 2⁹ = 21200220111659 is a prime.

It is a super-3 number, since 3×21200220112171³ (a number of 41 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21200220112177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600110056085 + 10600110056086.

It is an arithmetic number, because the mean of its divisors is an integer number (10600110056086).

Almost surely, 2^{21200220112171} is an apocalyptic number.

21200220112171 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200220112171 is an equidigital number, since it uses as much as digits as its factorization.

21200220112171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 22.

Adding to 21200220112171 its reverse (17121102200212), we get a palindrome (38321322312383).

The spelling of 21200220112171 in words is "twenty-one trillion, two hundred billion, two hundred twenty million, one hundred twelve thousand, one hundred seventy-one".