51055030021 has 2 divisors, whose sum is σ = 51055030022. Its totient is φ = 51055030020.

The previous prime is 51055029983. The next prime is 51055030051. The reversal of 51055030021 is 12003055015.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47453829921 + 3601200100 = 217839^2 + 60010^2 .

It is a cyclic number.

It is not a de Polignac number, because 51055030021 - 2²³ = 51046641413 is a prime.

It is a super-2 number, since 2×51055030021² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51055029974 and 51055030001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51055030051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25527515010 + 25527515011.

It is an arithmetic number, because the mean of its divisors is an integer number (25527515011).

Almost surely, 2^51055030021 is an apocalyptic number.

It is an amenable number.

51055030021 is a deficient number, since it is larger than the sum of its proper divisors (1).

51055030021 is an equidigital number, since it uses as much as digits as its factorization.

51055030021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 750, while the sum is 22.

Adding to 51055030021 its reverse (12003055015), we get a palindrome (63058085036).

The spelling of 51055030021 in words is "fifty-one billion, fifty-five million, thirty thousand, twenty-one".