51283038221 has 2 divisors, whose sum is σ = 51283038222. Its totient is φ = 51283038220.

The previous prime is 51283038211. The next prime is 51283038239. The reversal of 51283038221 is 12283038215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37029304900 + 14253733321 = 192430^2 + 119389^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51283038221 is a prime.

It is a super-3 number, since 3×51283038221³ (a number of 33 digits) contains 333 as substring.

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 (51283038211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25641519110 + 25641519111.

It is an arithmetic number, because the mean of its divisors is an integer number (25641519111).

Almost surely, 2^51283038221 is an apocalyptic number.

It is an amenable number.

51283038221 is a deficient number, since it is larger than the sum of its proper divisors (1).

51283038221 is an equidigital number, since it uses as much as digits as its factorization.

51283038221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 51283038221 in words is "fifty-one billion, two hundred eighty-three million, thirty-eight thousand, two hundred twenty-one".