51033136426721 has 2 divisors, whose sum is σ = 51033136426722. Its totient is φ = 51033136426720.

The previous prime is 51033136426693. The next prime is 51033136426751. The reversal of 51033136426721 is 12762463133015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42919531690000 + 8113604736721 = 6551300^2 + 2848439^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51033136426721 is a prime.

It is not a weakly prime, because it can be changed into another prime (51033136426751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25516568213360 + 25516568213361.

It is an arithmetic number, because the mean of its divisors is an integer number (25516568213361).

Almost surely, 2^{51033136426721} is an apocalyptic number.

It is an amenable number.

51033136426721 is a deficient number, since it is larger than the sum of its proper divisors (1).

51033136426721 is an equidigital number, since it uses as much as digits as its factorization.

51033136426721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 44.

Adding to 51033136426721 its reverse (12762463133015), we get a palindrome (63795599559736).

The spelling of 51033136426721 in words is "fifty-one trillion, thirty-three billion, one hundred thirty-six million, four hundred twenty-six thousand, seven hundred twenty-one".