2543135221 has 4 divisors (see below), whose sum is σ = 2774329344. Its totient is φ = 2311941100.

The previous prime is 2543135207. The next prime is 2543135269. The reversal of 2543135221 is 1225313452.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2543135221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2543135221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2543105221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115597045 + ... + 115597066.

It is an arithmetic number, because the mean of its divisors is an integer number (693582336).

Almost surely, 2^2543135221 is an apocalyptic number.

It is an amenable number.

2543135221 is a deficient number, since it is larger than the sum of its proper divisors (231194123).

2543135221 is a wasteful number, since it uses less digits than its factorization.

2543135221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231194122.

The product of its digits is 7200, while the sum is 28.

The square root of 2543135221 is about 50429.5074435593. The cubic root of 2543135221 is about 1364.9701400079.

Adding to 2543135221 its reverse (1225313452), we get a palindrome (3768448673).

The spelling of 2543135221 in words is "two billion, five hundred forty-three million, one hundred thirty-five thousand, two hundred twenty-one".