51807152121 has 8 divisors (see below), whose sum is σ = 69159530880. Its totient is φ = 34496437392.

The previous prime is 51807152099. The next prime is 51807152143. The reversal of 51807152121 is 12125170815.

It is an interprime number because it is at equal distance from previous prime (51807152099) and next prime (51807152143).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51807152121 - 2¹⁸ = 51806889977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51807152521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10413105 + ... + 10418078.

It is an arithmetic number, because the mean of its divisors is an integer number (8644941360).

Almost surely, 2^51807152121 is an apocalyptic number.

It is an amenable number.

51807152121 is a deficient number, since it is larger than the sum of its proper divisors (17352378759).

51807152121 is a wasteful number, since it uses less digits than its factorization.

51807152121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20832015.

The product of its (nonzero) digits is 5600, while the sum is 33.

The spelling of 51807152121 in words is "fifty-one billion, eight hundred seven million, one hundred fifty-two thousand, one hundred twenty-one".