2643213521 has 32 divisors (see below), whose sum is σ = 3025935360. Its totient is φ = 2290489344.

The previous prime is 2643213487. The next prime is 2643213523. The reversal of 2643213521 is 1253123462.

It is a happy number.

2643213521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-2643213521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2643213523) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7487681 + ... + 7488033.

It is an arithmetic number, because the mean of its divisors is an integer number (94560480).

Almost surely, 2^2643213521 is an apocalyptic number.

It is an amenable number.

2643213521 is a deficient number, since it is larger than the sum of its proper divisors (382721839).

2643213521 is a wasteful number, since it uses less digits than its factorization.

2643213521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785.

The product of its digits is 8640, while the sum is 29.

The square root of 2643213521 is about 51412.1923380048. The cubic root of 2643213521 is about 1382.6451961514.

Adding to 2643213521 its reverse (1253123462), we get a palindrome (3896336983).

The spelling of 2643213521 in words is "two billion, six hundred forty-three million, two hundred thirteen thousand, five hundred twenty-one".