5508421621 has 2 divisors, whose sum is σ = 5508421622. Its totient is φ = 5508421620.

The previous prime is 5508421619. The next prime is 5508421643. The reversal of 5508421621 is 1261248055.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4745280996 + 763140625 = 68886^2 + 27625^2 .

It is a cyclic number.

It is not a de Polignac number, because 5508421621 - 2¹ = 5508421619 is a prime.

Together with 5508421619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5508421601) 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 as a sum of consecutive naturals, namely, 2754210810 + 2754210811.

It is an arithmetic number, because the mean of its divisors is an integer number (2754210811).

Almost surely, 2^5508421621 is an apocalyptic number.

It is an amenable number.

5508421621 is a deficient number, since it is larger than the sum of its proper divisors (1).

5508421621 is an equidigital number, since it uses as much as digits as its factorization.

5508421621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 5508421621 is about 74218.7417098943. The cubic root of 5508421621 is about 1766.0746553510.

Adding to 5508421621 its reverse (1261248055), we get a palindrome (6769669676).

The spelling of 5508421621 in words is "five billion, five hundred eight million, four hundred twenty-one thousand, six hundred twenty-one".