51012421015 has 4 divisors (see below), whose sum is σ = 61214905224. Its totient is φ = 40809936808.

The previous prime is 51012421007. The next prime is 51012421063.

51012421015 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51012421015 - 2³ = 51012421007 is a prime.

It is a super-2 number, since 2×51012421015² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5101242097 + ... + 5101242106.

It is an arithmetic number, because the mean of its divisors is an integer number (15303726306).

Almost surely, 2^51012421015 is an apocalyptic number.

51012421015 is a deficient number, since it is larger than the sum of its proper divisors (10202484209).

51012421015 is a wasteful number, since it uses less digits than its factorization.

51012421015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10202484208.

The product of its (nonzero) digits is 400, while the sum is 22.

The spelling of 51012421015 in words is "fifty-one billion, twelve million, four hundred twenty-one thousand, fifteen".