51042121 has 8 divisors (see below), whose sum is σ = 55065920. Its totient is φ = 47032272.

The previous prime is 51042053. The next prime is 51042149. The reversal of 51042121 is 12124015.

51042121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51042121 - 2⁹ = 51041609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51042095 and 51042104.

It is not an unprimeable number, because it can be changed into a prime (51042191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4876 + ... + 11218.

It is an arithmetic number, because the mean of its divisors is an integer number (6883240).

Almost surely, 2^51042121 is an apocalyptic number.

It is an amenable number.

51042121 is a deficient number, since it is larger than the sum of its proper divisors (4023799).

51042121 is a wasteful number, since it uses less digits than its factorization.

51042121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6975.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 51042121 is about 7144.3768797566. The cubic root of 51042121 is about 370.9450421471.

Adding to 51042121 its reverse (12124015), we get a palindrome (63166136).

It can be divided in two parts, 5104 and 2121, that added together give a square (7225 = 85²).

The spelling of 51042121 in words is "fifty-one million, forty-two thousand, one hundred twenty-one".