11771212871 has 6 divisors (see below), whose sum is σ = 12938606016. Its totient is φ = 10701102500.

The previous prime is 11771212867. The next prime is 11771212907. The reversal of 11771212871 is 17821217711.

It is not a de Polignac number, because 11771212871 - 2² = 11771212867 is a prime.

It is a super-2 number, since 2×11771212871² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11771212571) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48641255 + ... + 48641496.

It is an arithmetic number, because the mean of its divisors is an integer number (2156434336).

Almost surely, 2^11771212871 is an apocalyptic number.

11771212871 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11771212871 is a deficient number, since it is larger than the sum of its proper divisors (1167393145).

11771212871 is an equidigital number, since it uses as much as digits as its factorization.

11771212871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97282773 (or 97282762 counting only the distinct ones).

The product of its digits is 10976, while the sum is 38.

The spelling of 11771212871 in words is "eleven billion, seven hundred seventy-one million, two hundred twelve thousand, eight hundred seventy-one".