51221412215 has 4 divisors (see below), whose sum is σ = 61465694664. Its totient is φ = 40977129768.

The previous prime is 51221412173. The next prime is 51221412247.

It is a happy number.

51221412215 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 51221412215 - 2¹⁴ = 51221395831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5122141217 + ... + 5122141226.

It is an arithmetic number, because the mean of its divisors is an integer number (15366423666).

Almost surely, 2^51221412215 is an apocalyptic number.

51221412215 is a deficient number, since it is larger than the sum of its proper divisors (10244282449).

51221412215 is a wasteful number, since it uses less digits than its factorization.

51221412215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10244282448.

The product of its digits is 1600, while the sum is 26.

The spelling of 51221412215 in words is "fifty-one billion, two hundred twenty-one million, four hundred twelve thousand, two hundred fifteen".