2171001 has 16 divisors (see below), whose sum is σ = 3359744. Its totient is φ = 1221264.

The previous prime is 2170943. The next prime is 2171003. The reversal of 2171001 is 1001712.

It is not a de Polignac number, because 2171001 - 2⁶ = 2170937 is a prime.

It is a Duffinian number.

2171001 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2171003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 636 + ... + 2178.

It is an arithmetic number, because the mean of its divisors is an integer number (209984).

2^2171001 is an apocalyptic number.

2171001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2171001 is a deficient number, since it is larger than the sum of its proper divisors (1188743).

2171001 is a wasteful number, since it uses less digits than its factorization.

2171001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1620.

The product of its (nonzero) digits is 14, while the sum is 12.

The square root of 2171001 is about 1473.4317086312. The cubic root of 2171001 is about 129.4851630015.

Adding to 2171001 its reverse (1001712), we get a palindrome (3172713).

The spelling of 2171001 in words is "two million, one hundred seventy-one thousand, one".