51142421213 has 24 divisors (see below), whose sum is σ = 59651089920. Its totient is φ = 43699106880.

The previous prime is 51142421177. The next prime is 51142421251. The reversal of 51142421213 is 31212424115.

It is a happy number.

It is not a de Polignac number, because 51142421213 - 2²⁴ = 51125643997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51142421263) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91718 + ... + 332711.

It is an arithmetic number, because the mean of its divisors is an integer number (2485462080).

Almost surely, 2^51142421213 is an apocalyptic number.

It is an amenable number.

51142421213 is a deficient number, since it is larger than the sum of its proper divisors (8508668707).

51142421213 is a wasteful number, since it uses less digits than its factorization.

51142421213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424509 (or 424496 counting only the distinct ones).

The product of its digits is 1920, while the sum is 26.

Adding to 51142421213 its reverse (31212424115), we get a palindrome (82354845328).

The spelling of 51142421213 in words is "fifty-one billion, one hundred forty-two million, four hundred twenty-one thousand, two hundred thirteen".