2555133221 has 4 divisors (see below), whose sum is σ = 2566099692. Its totient is φ = 2544166752.

The previous prime is 2555133209. The next prime is 2555133253. The reversal of 2555133221 is 1223315552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 575328196 + 1979805025 = 23986^2 + 44495^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2555133221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2555133121) 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, 5482886 + ... + 5483351.

It is an arithmetic number, because the mean of its divisors is an integer number (641524923).

Almost surely, 2^2555133221 is an apocalyptic number.

It is an amenable number.

2555133221 is a deficient number, since it is larger than the sum of its proper divisors (10966471).

2555133221 is a wasteful number, since it uses less digits than its factorization.

2555133221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10966470.

The product of its digits is 9000, while the sum is 29.

The square root of 2555133221 is about 50548.3256003599. The cubic root of 2555133221 is about 1367.1133246056.

Adding to 2555133221 its reverse (1223315552), we get a palindrome (3778448773).

The spelling of 2555133221 in words is "two billion, five hundred fifty-five million, one hundred thirty-three thousand, two hundred twenty-one".