51301253021 has 2 divisors, whose sum is σ = 51301253022. Its totient is φ = 51301253020.

The previous prime is 51301252991. The next prime is 51301253027. The reversal of 51301253021 is 12035210315.

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., 33219072121 + 18082180900 = 182261^2 + 134470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51301253021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51301253027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25650626510 + 25650626511.

It is an arithmetic number, because the mean of its divisors is an integer number (25650626511).

Almost surely, 2^51301253021 is an apocalyptic number.

It is an amenable number.

51301253021 is a deficient number, since it is larger than the sum of its proper divisors (1).

51301253021 is an equidigital number, since it uses as much as digits as its factorization.

51301253021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 23.

Adding to 51301253021 its reverse (12035210315), we get a palindrome (63336463336).

The spelling of 51301253021 in words is "fifty-one billion, three hundred one million, two hundred fifty-three thousand, twenty-one".