51421998113 has 2 divisors, whose sum is σ = 51421998114. Its totient is φ = 51421998112.

The previous prime is 51421998079. The next prime is 51421998137. The reversal of 51421998113 is 31189912415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50452796689 + 969201424 = 224617^2 + 31132^2 .

It is a cyclic number.

It is not a de Polignac number, because 51421998113 - 2⁸ = 51421997857 is a prime.

It is not a weakly prime, because it can be changed into another prime (51421998163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25710999056 + 25710999057.

It is an arithmetic number, because the mean of its divisors is an integer number (25710999057).

Almost surely, 2^51421998113 is an apocalyptic number.

It is an amenable number.

51421998113 is a deficient number, since it is larger than the sum of its proper divisors (1).

51421998113 is an equidigital number, since it uses as much as digits as its factorization.

51421998113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 44.

The spelling of 51421998113 in words is "fifty-one billion, four hundred twenty-one million, nine hundred ninety-eight thousand, one hundred thirteen".