2171312 has 60 divisors (see below), whose sum is σ = 5037624. Its totient is φ = 898560.

The previous prime is 2171311. The next prime is 2171329. The reversal of 2171312 is 2131712.

It is not an unprimeable number, because it can be changed into a prime (2171311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29708 + ... + 29780.

2^2171312 is an apocalyptic number.

2171312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2171312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2518812).

2171312 is an abundant number, since it is smaller than the sum of its proper divisors (2866312).

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

2171312 is a wasteful number, since it uses less digits than its factorization.

2171312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118 (or 99 counting only the distinct ones).

The product of its digits is 84, while the sum is 17.

The square root of 2171312 is about 1473.5372407917. The cubic root of 2171312 is about 129.4913457045.

The spelling of 2171312 in words is "two million, one hundred seventy-one thousand, three hundred twelve".