51405140121 has 4 divisors (see below), whose sum is σ = 68540186832. Its totient is φ = 34270093412.

The previous prime is 51405140089. The next prime is 51405140191. The reversal of 51405140121 is 12104150415.

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 51405140121 - 2⁵ = 51405140089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51405140091 and 51405140100.

It is not an unprimeable number, because it can be changed into a prime (51405140191) 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, 8567523351 + ... + 8567523356.

It is an arithmetic number, because the mean of its divisors is an integer number (17135046708).

Almost surely, 2^51405140121 is an apocalyptic number.

It is an amenable number.

51405140121 is a deficient number, since it is larger than the sum of its proper divisors (17135046711).

51405140121 is a wasteful number, since it uses less digits than its factorization.

51405140121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17135046710.

The product of its (nonzero) digits is 800, while the sum is 24.

Adding to 51405140121 its reverse (12104150415), we get a palindrome (63509290536).

The spelling of 51405140121 in words is "fifty-one billion, four hundred five million, one hundred forty thousand, one hundred twenty-one".