200021123171 has 2 divisors, whose sum is σ = 200021123172. Its totient is φ = 200021123170.

The previous prime is 200021123167. The next prime is 200021123243. The reversal of 200021123171 is 171321120002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 200021123171 - 2² = 200021123167 is a prime.

It is not a weakly prime, because it can be changed into another prime (200021129171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100010561585 + 100010561586.

It is an arithmetic number, because the mean of its divisors is an integer number (100010561586).

Almost surely, 2^200021123171 is an apocalyptic number.

200021123171 is a deficient number, since it is larger than the sum of its proper divisors (1).

200021123171 is an equidigital number, since it uses as much as digits as its factorization.

200021123171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 20.

Adding to 200021123171 its reverse (171321120002), we get a palindrome (371342243173).

The spelling of 200021123171 in words is "two hundred billion, twenty-one million, one hundred twenty-three thousand, one hundred seventy-one".