11771212869 has 32 divisors (see below), whose sum is σ = 18802627200. Its totient is φ = 7235205120.

The previous prime is 11771212867. The next prime is 11771212907. The reversal of 11771212869 is 96821217711.

It is a happy number.

It is not a de Polignac number, because 11771212869 - 2¹ = 11771212867 is a prime.

It is a super-2 number, since 2×11771212869² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11771212867) 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 31 ways as a sum of consecutive naturals, for example, 281989 + ... + 321029.

It is an arithmetic number, because the mean of its divisors is an integer number (587582100).

Almost surely, 2^11771212869 is an apocalyptic number.

It is an amenable number.

11771212869 is a deficient number, since it is larger than the sum of its proper divisors (7031414331).

11771212869 is a wasteful number, since it uses less digits than its factorization.

11771212869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39922 (or 39916 counting only the distinct ones).

The product of its digits is 84672, while the sum is 45.

The spelling of 11771212869 in words is "eleven billion, seven hundred seventy-one million, two hundred twelve thousand, eight hundred sixty-nine".