51221272227 has 16 divisors (see below), whose sum is σ = 72095520000. Its totient is φ = 32257570464.

The previous prime is 51221272213. The next prime is 51221272231. The reversal of 51221272227 is 72227212215.

It is not a de Polignac number, because 51221272227 - 2⁷ = 51221272099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51221272237) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1267527 + ... + 1307312.

It is an arithmetic number, because the mean of its divisors is an integer number (4505970000).

Almost surely, 2^51221272227 is an apocalyptic number.

51221272227 is a gapful number since it is divisible by the number (57) formed by its first and last digit.

51221272227 is a deficient number, since it is larger than the sum of its proper divisors (20874247773).

51221272227 is a wasteful number, since it uses less digits than its factorization.

51221272227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2575210.

The product of its digits is 15680, while the sum is 33.

The spelling of 51221272227 in words is "fifty-one billion, two hundred twenty-one million, two hundred seventy-two thousand, two hundred twenty-seven".