51274421221 has 2 divisors, whose sum is σ = 51274421222. Its totient is φ = 51274421220.

The previous prime is 51274421207. The next prime is 51274421267. The reversal of 51274421221 is 12212447215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41010705121 + 10263716100 = 202511^2 + 101310^2 .

It is a cyclic number.

It is not a de Polignac number, because 51274421221 - 2⁹ = 51274420709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51274424221) 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 as a sum of consecutive naturals, namely, 25637210610 + 25637210611.

It is an arithmetic number, because the mean of its divisors is an integer number (25637210611).

Almost surely, 2^51274421221 is an apocalyptic number.

It is an amenable number.

51274421221 is a deficient number, since it is larger than the sum of its proper divisors (1).

51274421221 is an equidigital number, since it uses as much as digits as its factorization.

51274421221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8960, while the sum is 31.

Adding to 51274421221 its reverse (12212447215), we get a palindrome (63486868436).

The spelling of 51274421221 in words is "fifty-one billion, two hundred seventy-four million, four hundred twenty-one thousand, two hundred twenty-one".