2643021 has 12 divisors (see below), whose sum is σ = 3921372. Its totient is φ = 1714176.

The previous prime is 2643019. The next prime is 2643037. The reversal of 2643021 is 1203462.

It is a happy number.

2643021 is a `hidden beast` number, since 2 + 643 + 0 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2528100 + 114921 = 1590^2 + 339^2 .

It is not a de Polignac number, because 2643021 - 2¹ = 2643019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2642985 and 2643003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2643061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3636 + ... + 4301.

It is an arithmetic number, because the mean of its divisors is an integer number (326781).

2^2643021 is an apocalyptic number.

It is an amenable number.

2643021 is a deficient number, since it is larger than the sum of its proper divisors (1278351).

2643021 is a wasteful number, since it uses less digits than its factorization.

2643021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7980 (or 7977 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 2643021 is about 1625.7370636115. The cubic root of 2643021 is about 138.2611626572.

Adding to 2643021 its reverse (1203462), we get a palindrome (3846483).

The spelling of 2643021 in words is "two million, six hundred forty-three thousand, twenty-one".