5211421 has 2 divisors, whose sum is σ = 5211422. Its totient is φ = 5211420.

The previous prime is 5211391. The next prime is 5211431. The reversal of 5211421 is 1241125.

5211421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5040025 + 171396 = 2245^2 + 414^2 .

It is a cyclic number.

It is not a de Polignac number, because 5211421 - 2⁵ = 5211389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 5211395 and 5211404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5211431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2605710 + 2605711.

It is an arithmetic number, because the mean of its divisors is an integer number (2605711).

Almost surely, 2^5211421 is an apocalyptic number.

It is an amenable number.

5211421 is a deficient number, since it is larger than the sum of its proper divisors (1).

5211421 is an equidigital number, since it uses as much as digits as its factorization.

5211421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80, while the sum is 16.

The square root of 5211421 is about 2282.8536965824. The cubic root of 5211421 is about 173.3745657169.

Adding to 5211421 its reverse (1241125), we get a palindrome (6452546).

The spelling of 5211421 in words is "five million, two hundred eleven thousand, four hundred twenty-one".