2163021 has 8 divisors (see below), whose sum is σ = 3296064. Its totient is φ = 1236000.

The previous prime is 2163013. The next prime is 2163041. The reversal of 2163021 is 1203612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2163021 - 2³ = 2163013 is a prime.

It is a Smith number, since the sum of its digits (15) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

2163021 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2163011) 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 7 ways as a sum of consecutive naturals, for example, 51480 + ... + 51521.

It is an arithmetic number, because the mean of its divisors is an integer number (412008).

2^2163021 is an apocalyptic number.

2163021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2163021 is a deficient number, since it is larger than the sum of its proper divisors (1133043).

2163021 is a wasteful number, since it uses less digits than its factorization.

2163021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103011.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 2163021 is about 1470.7212516313. The cubic root of 2163021 is about 129.3263176542.

Adding to 2163021 its reverse (1203612), we get a palindrome (3366633).

The spelling of 2163021 in words is "two million, one hundred sixty-three thousand, twenty-one".