51050051021 has 2 divisors, whose sum is σ = 51050051022. Its totient is φ = 51050051020.

The previous prime is 51050050999. The next prime is 51050051093. The reversal of 51050051021 is 12015005015.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25708594921 + 25341456100 = 160339^2 + 159190^2 .

It is a cyclic number.

It is not a de Polignac number, because 51050051021 - 2³⁴ = 33870181837 is a prime.

It is a super-2 number, since 2×51050051021² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51050050984 and 51050051002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51050057021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25525025510 + 25525025511.

It is an arithmetic number, because the mean of its divisors is an integer number (25525025511).

Almost surely, 2^51050051021 is an apocalyptic number.

It is an amenable number.

51050051021 is a deficient number, since it is larger than the sum of its proper divisors (1).

51050051021 is an equidigital number, since it uses as much as digits as its factorization.

51050051021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 250, while the sum is 20.

Adding to 51050051021 its reverse (12015005015), we get a palindrome (63065056036).

The spelling of 51050051021 in words is "fifty-one billion, fifty million, fifty-one thousand, twenty-one".