51038408821 has 2 divisors, whose sum is σ = 51038408822. Its totient is φ = 51038408820.

The previous prime is 51038408737. The next prime is 51038408867. The reversal of 51038408821 is 12880483015.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39090825796 + 11947583025 = 197714^2 + 109305^2 .

It is a cyclic number.

It is not a de Polignac number, because 51038408821 - 2²⁵ = 51004854389 is a prime.

It is a super-2 number, since 2×51038408821² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51038408921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25519204410 + 25519204411.

It is an arithmetic number, because the mean of its divisors is an integer number (25519204411).

Almost surely, 2^51038408821 is an apocalyptic number.

It is an amenable number.

51038408821 is a deficient number, since it is larger than the sum of its proper divisors (1).

51038408821 is an equidigital number, since it uses as much as digits as its factorization.

51038408821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61440, while the sum is 40.

The spelling of 51038408821 in words is "fifty-one billion, thirty-eight million, four hundred eight thousand, eight hundred twenty-one".