2191771912 has 32 divisors (see below), whose sum is σ = 4527576000. Its totient is φ = 986392000.

The previous prime is 2191771861. The next prime is 2191771927.

2191771912 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×2191771912² = 9607728228464271488, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114412 + ... + 132187.

It is an arithmetic number, because the mean of its divisors is an integer number (141486750).

Almost surely, 2^2191771912 is an apocalyptic number.

2191771912 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2191771912 is an abundant number, since it is smaller than the sum of its proper divisors (2335804088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2191771912 is a wasteful number, since it uses less digits than its factorization.

2191771912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246717 (or 246713 counting only the distinct ones).

The product of its digits is 15876, while the sum is 40.

The square root of 2191771912 is about 46816.3637203916. The cubic root of 2191771912 is about 1298.9679999023.

The spelling of 2191771912 in words is "two billion, one hundred ninety-one million, seven hundred seventy-one thousand, nine hundred twelve".