51004403621 has 8 divisors (see below), whose sum is σ = 51625013664. Its totient is φ = 50383938960.

The previous prime is 51004403609. The next prime is 51004403623. The reversal of 51004403621 is 12630440015.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51004403621 - 2¹⁸ = 51004141477 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 (51004403623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 780410 + ... + 843236.

It is an arithmetic number, because the mean of its divisors is an integer number (6453126708).

Almost surely, 2^51004403621 is an apocalyptic number.

It is an amenable number.

51004403621 is a deficient number, since it is larger than the sum of its proper divisors (620610043).

51004403621 is an equidigital number, since it uses as much as digits as its factorization.

51004403621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72691.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 51004403621 its reverse (12630440015), we get a palindrome (63634843636).

The spelling of 51004403621 in words is "fifty-one billion, four million, four hundred three thousand, six hundred twenty-one".