51221255306 has 32 divisors (see below), whose sum is σ = 87625858320. Its totient is φ = 22245728256.

The previous prime is 51221255219. The next prime is 51221255311. The reversal of 51221255306 is 60355212215.

It can be written as a sum of positive squares in 8 ways, for example, as 29181180625 + 22040074681 = 170825^2 + 148459^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3833870 + ... + 3847206.

Almost surely, 2^51221255306 is an apocalyptic number.

51221255306 is a deficient number, since it is larger than the sum of its proper divisors (36404603014).

51221255306 is a wasteful number, since it uses less digits than its factorization.

51221255306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22058.

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

The spelling of 51221255306 in words is "fifty-one billion, two hundred twenty-one million, two hundred fifty-five thousand, three hundred six".