51030042521 has 4 divisors (see below), whose sum is σ = 51069571344. Its totient is φ = 50990513700.

The previous prime is 51030042463. The next prime is 51030042533. The reversal of 51030042521 is 12524003015.

51030042521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51030042521 - 2⁶ = 51030042457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51030042551) 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, 19762475 + ... + 19765056.

It is an arithmetic number, because the mean of its divisors is an integer number (12767392836).

Almost surely, 2^51030042521 is an apocalyptic number.

It is an amenable number.

51030042521 is a deficient number, since it is larger than the sum of its proper divisors (39528823).

51030042521 is a wasteful number, since it uses less digits than its factorization.

51030042521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39528822.

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 51030042521 its reverse (12524003015), we get a palindrome (63554045536).

The spelling of 51030042521 in words is "fifty-one billion, thirty million, forty-two thousand, five hundred twenty-one".