51235134433421 has 2 divisors, whose sum is σ = 51235134433422. Its totient is φ = 51235134433420.

The previous prime is 51235134433321. The next prime is 51235134433463. The reversal of 51235134433421 is 12433443153215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44457703210921 + 6777431222500 = 6667661^2 + 2603350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51235134433421 is a prime.

It is a Sophie Germain 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 (51235134433121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25617567216710 + 25617567216711.

It is an arithmetic number, because the mean of its divisors is an integer number (25617567216711).

Almost surely, 2^{51235134433421} is an apocalyptic number.

It is an amenable number.

51235134433421 is a deficient number, since it is larger than the sum of its proper divisors (1).

51235134433421 is an equidigital number, since it uses as much as digits as its factorization.

51235134433421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518400, while the sum is 41.

Adding to 51235134433421 its reverse (12433443153215), we get a palindrome (63668577586636).

The spelling of 51235134433421 in words is "fifty-one trillion, two hundred thirty-five billion, one hundred thirty-four million, four hundred thirty-three thousand, four hundred twenty-one".