51432215121 has 24 divisors (see below), whose sum is σ = 85256297984. Its totient is φ = 29267879040.

The previous prime is 51432215117. The next prime is 51432215137. The reversal of 51432215121 is 12151223415.

It is a happy number.

51432215121 is a `hidden beast` number, since 5 + 1 + 432 + 215 + 12 + 1 = 666.

It is not a de Polignac number, because 51432215121 - 2² = 51432215117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51432215101) 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 23 ways as a sum of consecutive naturals, for example, 1678561 + ... + 1708926.

Almost surely, 2^51432215121 is an apocalyptic number.

It is an amenable number.

51432215121 is a deficient number, since it is larger than the sum of its proper divisors (33824082863).

51432215121 is a wasteful number, since it uses less digits than its factorization.

51432215121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3387741 (or 3387738 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

Adding to 51432215121 its reverse (12151223415), we get a palindrome (63583438536).

The spelling of 51432215121 in words is "fifty-one billion, four hundred thirty-two million, two hundred fifteen thousand, one hundred twenty-one".