5211223421 has 2 divisors, whose sum is σ = 5211223422. Its totient is φ = 5211223420.

The previous prime is 5211223403. The next prime is 5211223429. The reversal of 5211223421 is 1243221125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3247404196 + 1963819225 = 56986^2 + 44315^2 .

It is a cyclic number.

It is not a de Polignac number, because 5211223421 - 2¹⁸ = 5210961277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5211223429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2605611710 + 2605611711.

It is an arithmetic number, because the mean of its divisors is an integer number (2605611711).

Almost surely, 2^5211223421 is an apocalyptic number.

It is an amenable number.

5211223421 is a deficient number, since it is larger than the sum of its proper divisors (1).

5211223421 is an equidigital number, since it uses as much as digits as its factorization.

5211223421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 23.

The square root of 5211223421 is about 72188.8039864909. The cubic root of 5211223421 is about 1733.7237465700.

Adding to 5211223421 its reverse (1243221125), we get a palindrome (6454444546).

The spelling of 5211223421 in words is "five billion, two hundred eleven million, two hundred twenty-three thousand, four hundred twenty-one".