11821671771 has 32 divisors (see below), whose sum is σ = 19529932800. Its totient is φ = 6193736064.

The previous prime is 11821671751. The next prime is 11821671793. The reversal of 11821671771 is 17717612811.

It is not a de Polignac number, because 11821671771 - 2⁶ = 11821671707 is a prime.

It is a super-4 number, since 4×11821671771⁴ (a number of 41 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (11821671751) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104635 + ... + 185988.

It is an arithmetic number, because the mean of its divisors is an integer number (610310400).

Almost surely, 2^11821671771 is an apocalyptic number.

11821671771 is a deficient number, since it is larger than the sum of its proper divisors (7708261029).

11821671771 is a wasteful number, since it uses less digits than its factorization.

11821671771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290795.

The product of its digits is 32928, while the sum is 42.

The spelling of 11821671771 in words is "eleven billion, eight hundred twenty-one million, six hundred seventy-one thousand, seven hundred seventy-one".