5247611221 has 4 divisors (see below), whose sum is σ = 5556294252. Its totient is φ = 4938928192.

The previous prime is 5247611191. The next prime is 5247611251. The reversal of 5247611221 is 1221167425.

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

It is an interprime number because it is at equal distance from previous prime (5247611191) and next prime (5247611251).

It can be written as a sum of positive squares in 2 ways, for example, as 4058327025 + 1189284196 = 63705^2 + 34486^2 .

It is a cyclic number.

It is not a de Polignac number, because 5247611221 - 2⁵ = 5247611189 is a prime.

It is a super-2 number, since 2×5247611221² = 55074847053530221682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5247611251) 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, 154341490 + ... + 154341523.

It is an arithmetic number, because the mean of its divisors is an integer number (1389073563).

Almost surely, 2^5247611221 is an apocalyptic number.

It is an amenable number.

5247611221 is a deficient number, since it is larger than the sum of its proper divisors (308683031).

5247611221 is a wasteful number, since it uses less digits than its factorization.

5247611221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308683030.

The product of its digits is 6720, while the sum is 31.

The square root of 5247611221 is about 72440.3977142589. The cubic root of 5247611221 is about 1737.7496805656.

Adding to 5247611221 its reverse (1221167425), we get a palindrome (6468778646).

The spelling of 5247611221 in words is "five billion, two hundred forty-seven million, six hundred eleven thousand, two hundred twenty-one".