20211000202171 has 2 divisors, whose sum is σ = 20211000202172. Its totient is φ = 20211000202170.

The previous prime is 20211000202103. The next prime is 20211000202207. The reversal of 20211000202171 is 17120200011202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20211000202171 - 2¹¹ = 20211000200123 is a prime.

It is a super-2 number, since 2×20211000202171² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20211000202871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105500101085 + 10105500101086.

It is an arithmetic number, because the mean of its divisors is an integer number (10105500101086).

Almost surely, 2^{20211000202171} is an apocalyptic number.

20211000202171 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211000202171 is an equidigital number, since it uses as much as digits as its factorization.

20211000202171 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 19.

Adding to 20211000202171 its reverse (17120200011202), we get a palindrome (37331200213373).

The spelling of 20211000202171 in words is "twenty trillion, two hundred eleven billion, two hundred two thousand, one hundred seventy-one".