51036221 has 2 divisors, whose sum is σ = 51036222. Its totient is φ = 51036220.

The previous prime is 51036203. The next prime is 51036233. The reversal of 51036221 is 12263015.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32330596 + 18705625 = 5686^2 + 4325^2 .

It is a cyclic number.

It is not a de Polignac number, because 51036221 - 2⁶ = 51036157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51036193 and 51036202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51036281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25518110 + 25518111.

It is an arithmetic number, because the mean of its divisors is an integer number (25518111).

Almost surely, 2^51036221 is an apocalyptic number.

It is an amenable number.

51036221 is a deficient number, since it is larger than the sum of its proper divisors (1).

51036221 is an equidigital number, since it uses as much as digits as its factorization.

51036221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 51036221 is about 7143.9639556761. The cubic root of 51036221 is about 370.9307489840.

Adding to 51036221 its reverse (12263015), we get a palindrome (63299236).

The spelling of 51036221 in words is "fifty-one million, thirty-six thousand, two hundred twenty-one".