20121022171 has 2 divisors, whose sum is σ = 20121022172. Its totient is φ = 20121022170.

The previous prime is 20121022139. The next prime is 20121022213. The reversal of 20121022171 is 17122012102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20121022171 - 2⁵ = 20121022139 is a prime.

It is not a weakly prime, because it can be changed into another prime (20121022111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060511085 + 10060511086.

It is an arithmetic number, because the mean of its divisors is an integer number (10060511086).

Almost surely, 2^20121022171 is an apocalyptic number.

20121022171 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121022171 is an equidigital number, since it uses as much as digits as its factorization.

20121022171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 19.

Adding to 20121022171 its reverse (17122012102), we get a palindrome (37243034273).

The spelling of 20121022171 in words is "twenty billion, one hundred twenty-one million, twenty-two thousand, one hundred seventy-one".