51104430521 has 4 divisors (see below), whose sum is σ = 51109874832. Its totient is φ = 51098986212.

The previous prime is 51104430499. The next prime is 51104430563. The reversal of 51104430521 is 12503440115.

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.

It is a cyclic number.

It is not a de Polignac number, because 51104430521 - 2³⁴ = 33924561337 is a prime.

It is a super-2 number, since 2×51104430521² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51104430121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2708051 + ... + 2726856.

It is an arithmetic number, because the mean of its divisors is an integer number (12777468708).

Almost surely, 2^51104430521 is an apocalyptic number.

It is an amenable number.

51104430521 is a deficient number, since it is larger than the sum of its proper divisors (5444311).

51104430521 is an equidigital number, since it uses as much as digits as its factorization.

51104430521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5444310.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 51104430521 its reverse (12503440115), we get a palindrome (63607870636).

The spelling of 51104430521 in words is "fifty-one billion, one hundred four million, four hundred thirty thousand, five hundred twenty-one".