51620053421 has 2 divisors, whose sum is σ = 51620053422. Its totient is φ = 51620053420.

The previous prime is 51620053409. The next prime is 51620053439. The reversal of 51620053421 is 12435002615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29571961225 + 22048092196 = 171965^2 + 148486^2 .

It is a cyclic number.

It is not a de Polignac number, because 51620053421 - 2¹⁴ = 51620037037 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 (51620053451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25810026710 + 25810026711.

It is an arithmetic number, because the mean of its divisors is an integer number (25810026711).

Almost surely, 2^51620053421 is an apocalyptic number.

It is an amenable number.

51620053421 is a deficient number, since it is larger than the sum of its proper divisors (1).

51620053421 is an equidigital number, since it uses as much as digits as its factorization.

51620053421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 29.

The spelling of 51620053421 in words is "fifty-one billion, six hundred twenty million, fifty-three thousand, four hundred twenty-one".