20211156271 has 4 divisors (see below), whose sum is σ = 20704111344. Its totient is φ = 19718201200.

The previous prime is 20211156221. The next prime is 20211156293. The reversal of 20211156271 is 17265111202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20211156271 - 2⁷ = 20211156143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211156221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246477475 + ... + 246477556.

It is an arithmetic number, because the mean of its divisors is an integer number (5176027836).

Almost surely, 2^20211156271 is an apocalyptic number.

20211156271 is a deficient number, since it is larger than the sum of its proper divisors (492955073).

20211156271 is an equidigital number, since it uses as much as digits as its factorization.

20211156271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492955072.

The product of its (nonzero) digits is 1680, while the sum is 28.

Adding to 20211156271 its reverse (17265111202), we get a palindrome (37476267473).

The spelling of 20211156271 in words is "twenty billion, two hundred eleven million, one hundred fifty-six thousand, two hundred seventy-one".