5122511221 has 4 divisors (see below), whose sum is σ = 5125455244. Its totient is φ = 5119567200.

The previous prime is 5122511203. The next prime is 5122511293. The reversal of 5122511221 is 1221152215.

It is a happy number.

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 185340996 + 4937170225 = 13614^2 + 70265^2 .

It is a cyclic number.

It is not a de Polignac number, because 5122511221 - 2⁵ = 5122511189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5122511192 and 5122511201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5122511201) 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, 1469400 + ... + 1472881.

It is an arithmetic number, because the mean of its divisors is an integer number (1281363811).

Almost surely, 2^5122511221 is an apocalyptic number.

It is an amenable number.

5122511221 is a deficient number, since it is larger than the sum of its proper divisors (2944023).

5122511221 is a wasteful number, since it uses less digits than its factorization.

5122511221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2944022.

The product of its digits is 400, while the sum is 22.

The square root of 5122511221 is about 71571.7208190498. The cubic root of 5122511221 is about 1723.8294904291.

Adding to 5122511221 its reverse (1221152215), we get a palindrome (6343663436).

The spelling of 5122511221 in words is "five billion, one hundred twenty-two million, five hundred eleven thousand, two hundred twenty-one".