12261311271 has 36 divisors (see below), whose sum is σ = 19656406224. Its totient is φ = 7358883840.

The previous prime is 12261311269. The next prime is 12261311297. The reversal of 12261311271 is 17211316221.

12261311271 is a `hidden beast` number, since 1 + 22 + 61 + 311 + 271 = 666.

It is not a de Polignac number, because 12261311271 - 2¹ = 12261311269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12261319271) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 57511 + ... + 166823.

It is an arithmetic number, because the mean of its divisors is an integer number (546011284).

Almost surely, 2^12261311271 is an apocalyptic number.

12261311271 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12261311271 is a deficient number, since it is larger than the sum of its proper divisors (7395094953).

12261311271 is a wasteful number, since it uses less digits than its factorization.

12261311271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109444 (or 109430 counting only the distinct ones).

The product of its digits is 1008, while the sum is 27.

Adding to 12261311271 its reverse (17211316221), we get a palindrome (29472627492).

The spelling of 12261311271 in words is "twelve billion, two hundred sixty-one million, three hundred eleven thousand, two hundred seventy-one".