2171256 has 16 divisors (see below), whose sum is σ = 5428200. Its totient is φ = 723744.

The previous prime is 2171249. The next prime is 2171261. The reversal of 2171256 is 6521712.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 90469 = 2171256 / (2 + 1 + 7 + 1 + 2 + 5 + 6).

It is a nialpdrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45211 + ... + 45258.

2^2171256 is an apocalyptic number.

It is an amenable number.

2171256 is an abundant number, since it is smaller than the sum of its proper divisors (3256944).

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

2171256 is a wasteful number, since it uses less digits than its factorization.

2171256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90478 (or 90474 counting only the distinct ones).

The product of its digits is 840, while the sum is 24.

The square root of 2171256 is about 1473.5182387741. The cubic root of 2171256 is about 129.4902324640.

Adding to 2171256 its reverse (6521712), we get a palindrome (8692968).

The spelling of 2171256 in words is "two million, one hundred seventy-one thousand, two hundred fifty-six".