2516411221 has 4 divisors (see below), whose sum is σ = 2563890732. Its totient is φ = 2468931712.

The previous prime is 2516411197. The next prime is 2516411237. The reversal of 2516411221 is 1221146152.

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 2172864996 + 343546225 = 46614^2 + 18535^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2516411221 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 (2516411021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23739676 + ... + 23739781.

It is an arithmetic number, because the mean of its divisors is an integer number (640972683).

Almost surely, 2^2516411221 is an apocalyptic number.

It is an amenable number.

2516411221 is a deficient number, since it is larger than the sum of its proper divisors (47479511).

2516411221 is an equidigital number, since it uses as much as digits as its factorization.

2516411221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47479510.

The product of its digits is 960, while the sum is 25.

The square root of 2516411221 is about 50163.8437622158. The cubic root of 2516411221 is about 1360.1721273272.

Adding to 2516411221 its reverse (1221146152), we get a palindrome (3737557373).

The spelling of 2516411221 in words is "two billion, five hundred sixteen million, four hundred eleven thousand, two hundred twenty-one".