20212021100171 has 2 divisors, whose sum is σ = 20212021100172. Its totient is φ = 20212021100170.

The previous prime is 20212021100137. The next prime is 20212021100209. The reversal of 20212021100171 is 17100112021202.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20212021100171 is a prime.

It is not a weakly prime, because it can be changed into another prime (20212021100371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106010550085 + 10106010550086.

It is an arithmetic number, because the mean of its divisors is an integer number (10106010550086).

Almost surely, 2^{20212021100171} is an apocalyptic number.

20212021100171 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212021100171 is an equidigital number, since it uses as much as digits as its factorization.

20212021100171 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 20212021100171 its reverse (17100112021202), we get a palindrome (37312133121373).

The spelling of 20212021100171 in words is "twenty trillion, two hundred twelve billion, twenty-one million, one hundred thousand, one hundred seventy-one".