5251441421 has 2 divisors, whose sum is σ = 5251441422. Its totient is φ = 5251441420.

The previous prime is 5251441309. The next prime is 5251441463. The reversal of 5251441421 is 1241441525.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4893702025 + 357739396 = 69955^2 + 18914^2 .

It is a cyclic number.

It is not a de Polignac number, because 5251441421 - 2¹⁸ = 5251179277 is a prime.

It is a super-4 number, since 4×5251441421⁴ (a number of 40 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5251440421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625720710 + 2625720711.

It is an arithmetic number, because the mean of its divisors is an integer number (2625720711).

Almost surely, 2^5251441421 is an apocalyptic number.

It is an amenable number.

5251441421 is a deficient number, since it is larger than the sum of its proper divisors (1).

5251441421 is an equidigital number, since it uses as much as digits as its factorization.

5251441421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6400, while the sum is 29.

The square root of 5251441421 is about 72466.8297981911. The cubic root of 5251441421 is about 1738.1723687710.

Adding to 5251441421 its reverse (1241441525), we get a palindrome (6492882946).

The spelling of 5251441421 in words is "five billion, two hundred fifty-one million, four hundred forty-one thousand, four hundred twenty-one".