20111272171 has 16 divisors (see below), whose sum is σ = 21297203200. Its totient is φ = 18938354688.

The previous prime is 20111272141. The next prime is 20111272177. The reversal of 20111272171 is 17127211102.

It is a cyclic number.

It is not a de Polignac number, because 20111272171 - 2¹⁹ = 20110747883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20111272177) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3077035 + ... + 3083563.

It is an arithmetic number, because the mean of its divisors is an integer number (1331075200).

Almost surely, 2^20111272171 is an apocalyptic number.

20111272171 is a deficient number, since it is larger than the sum of its proper divisors (1185931029).

20111272171 is a wasteful number, since it uses less digits than its factorization.

20111272171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7498.

The product of its (nonzero) digits is 392, while the sum is 25.

Adding to 20111272171 its reverse (17127211102), we get a palindrome (37238483273).

The spelling of 20111272171 in words is "twenty billion, one hundred eleven million, two hundred seventy-two thousand, one hundred seventy-one".