2171912 has 8 divisors (see below), whose sum is σ = 4072350. Its totient is φ = 1085952.

The previous prime is 2171899. The next prime is 2171929. The reversal of 2171912 is 2191712.

It can be written as a sum of positive squares in only one way, i.e., 1223236 + 948676 = 1106^2 + 974^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 135737 + ... + 135752.

2^2171912 is an apocalyptic number.

It is an amenable number.

2171912 is a deficient number, since it is larger than the sum of its proper divisors (1900438).

2171912 is a wasteful number, since it uses less digits than its factorization.

2171912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271495 (or 271491 counting only the distinct ones).

The product of its digits is 252, while the sum is 23.

The square root of 2171912 is about 1473.7408184616. The cubic root of 2171912 is about 129.5032720808.

The spelling of 2171912 in words is "two million, one hundred seventy-one thousand, nine hundred twelve".