20121211171 has 2 divisors, whose sum is σ = 20121211172. Its totient is φ = 20121211170.

The previous prime is 20121211157. The next prime is 20121211267. The reversal of 20121211171 is 17111212102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20121211171 - 2⁵ = 20121211139 is a prime.

It is not a weakly prime, because it can be changed into another prime (20121211151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060605585 + 10060605586.

It is an arithmetic number, because the mean of its divisors is an integer number (10060605586).

Almost surely, 2^20121211171 is an apocalyptic number.

20121211171 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121211171 is an equidigital number, since it uses as much as digits as its factorization.

20121211171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 19.

Adding to 20121211171 its reverse (17111212102), we get a palindrome (37232423273).

The spelling of 20121211171 in words is "twenty billion, one hundred twenty-one million, two hundred eleven thousand, one hundred seventy-one".