2505011221 has 16 divisors (see below), whose sum is σ = 2553078528. Its totient is φ = 2457604800.

The previous prime is 2505011219. The next prime is 2505011227. The reversal of 2505011221 is 1221105052.

It is a cyclic number.

It is not a de Polignac number, because 2505011221 - 2¹ = 2505011219 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 (2505011227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5811876 + ... + 5812306.

It is an arithmetic number, because the mean of its divisors is an integer number (159567408).

Almost surely, 2^2505011221 is an apocalyptic number.

It is an amenable number.

2505011221 is a deficient number, since it is larger than the sum of its proper divisors (48067307).

2505011221 is a wasteful number, since it uses less digits than its factorization.

2505011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 2505011221 is about 50050.0871228013. The cubic root of 2505011221 is about 1358.1150394945.

Adding to 2505011221 its reverse (1221105052), we get a palindrome (3726116273).

The spelling of 2505011221 in words is "two billion, five hundred five million, eleven thousand, two hundred twenty-one".