53251421 has 2 divisors, whose sum is σ = 53251422. Its totient is φ = 53251420.

The previous prime is 53251411. The next prime is 53251427. The reversal of 53251421 is 12415235.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36120100 + 17131321 = 6010^2 + 4139^2 .

It is a cyclic number.

It is not a de Polignac number, because 53251421 - 2¹⁰ = 53250397 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53251427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26625710 + 26625711.

It is an arithmetic number, because the mean of its divisors is an integer number (26625711).

Almost surely, 2^53251421 is an apocalyptic number.

It is an amenable number.

53251421 is a deficient number, since it is larger than the sum of its proper divisors (1).

53251421 is an equidigital number, since it uses as much as digits as its factorization.

53251421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1200, while the sum is 23.

The square root of 53251421 is about 7297.3571243293. The cubic root of 53251421 is about 376.2216066696.

Adding to 53251421 its reverse (12415235), we get a palindrome (65666656).

The spelling of 53251421 in words is "fifty-three million, two hundred fifty-one thousand, four hundred twenty-one".