51221334515 has 32 divisors (see below), whose sum is σ = 66924579456. Its totient is φ = 37407928320.

The previous prime is 51221334511. The next prime is 51221334539. The reversal of 51221334515 is 51543312215.

It is not a de Polignac number, because 51221334515 - 2² = 51221334511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51221334511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13951130 + ... + 13954800.

It is an arithmetic number, because the mean of its divisors is an integer number (2091393108).

Almost surely, 2^51221334515 is an apocalyptic number.

51221334515 is a deficient number, since it is larger than the sum of its proper divisors (15703244941).

51221334515 is a wasteful number, since it uses less digits than its factorization.

51221334515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5999.

The product of its digits is 18000, while the sum is 32.

The spelling of 51221334515 in words is "fifty-one billion, two hundred twenty-one million, three hundred thirty-four thousand, five hundred fifteen".