51333467821 has 4 divisors (see below), whose sum is σ = 52425669312. Its totient is φ = 50241266332.

The previous prime is 51333467789. The next prime is 51333467831. The reversal of 51333467821 is 12876433315.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12876433315 = 5 ⋅2575286663.

It is a cyclic number.

It is not a de Polignac number, because 51333467821 - 2⁵ = 51333467789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51333467831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 546100675 + ... + 546100768.

It is an arithmetic number, because the mean of its divisors is an integer number (13106417328).

Almost surely, 2^51333467821 is an apocalyptic number.

It is an amenable number.

51333467821 is a deficient number, since it is larger than the sum of its proper divisors (1092201491).

51333467821 is a wasteful number, since it uses less digits than its factorization.

51333467821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092201490.

The product of its digits is 362880, while the sum is 43.

The spelling of 51333467821 in words is "fifty-one billion, three hundred thirty-three million, four hundred sixty-seven thousand, eight hundred twenty-one".