51131014562421 has 6 divisors (see below), whose sum is σ = 73855909923510. Its totient is φ = 34087343041608.

The previous prime is 51131014562393. The next prime is 51131014562429. The reversal of 51131014562421 is 12426541013115.

51131014562421 is a `hidden beast` number, since 5 + 1 + 1 + 3 + 1 + 0 + 1 + 4 + 5 + 624 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 50493971139921 + 637043422500 = 7105911^2 + 798150^2 .

It is not a de Polignac number, because 51131014562421 - 2⁶ = 51131014562357 is a prime.

It is a super-3 number, since 3×51131014562421³ (a number of 42 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51131014562429) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2840611920126 + ... + 2840611920143.

It is an arithmetic number, because the mean of its divisors is an integer number (12309318320585).

Almost surely, 2^{51131014562421} is an apocalyptic number.

It is an amenable number.

51131014562421 is a deficient number, since it is larger than the sum of its proper divisors (22724895361089).

51131014562421 is a wasteful number, since it uses less digits than its factorization.

51131014562421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5681223840275 (or 5681223840272 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

Adding to 51131014562421 its reverse (12426541013115), we get a palindrome (63557555575536).

The spelling of 51131014562421 in words is "fifty-one trillion, one hundred thirty-one billion, fourteen million, five hundred sixty-two thousand, four hundred twenty-one".