51240421461 has 16 divisors (see below), whose sum is σ = 68534968320. Its totient is φ = 34053146160.

The previous prime is 51240421447. The next prime is 51240421469. The reversal of 51240421461 is 16412404215.

It is not a de Polignac number, because 51240421461 - 2⁷ = 51240421333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51240421469) 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 15 ways as a sum of consecutive naturals, for example, 3904036 + ... + 3917138.

It is an arithmetic number, because the mean of its divisors is an integer number (4283435520).

Almost surely, 2^51240421461 is an apocalyptic number.

It is an amenable number.

51240421461 is a deficient number, since it is larger than the sum of its proper divisors (17294546859).

51240421461 is a wasteful number, since it uses less digits than its factorization.

51240421461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17096.

The product of its (nonzero) digits is 7680, while the sum is 30.

Adding to 51240421461 its reverse (16412404215), we get a palindrome (67652825676).

The spelling of 51240421461 in words is "fifty-one billion, two hundred forty million, four hundred twenty-one thousand, four hundred sixty-one".