51571021 has 2 divisors, whose sum is σ = 51571022. Its totient is φ = 51571020.

The previous prime is 51570983. The next prime is 51571027. The reversal of 51571021 is 12017515.

51571021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51194025 + 376996 = 7155^2 + 614^2 .

It is a cyclic number.

It is not a de Polignac number, because 51571021 - 2²¹ = 49473869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51570983 and 51571001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51571027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25785510 + 25785511.

It is an arithmetic number, because the mean of its divisors is an integer number (25785511).

Almost surely, 2^51571021 is an apocalyptic number.

It is an amenable number.

51571021 is a deficient number, since it is larger than the sum of its proper divisors (1).

51571021 is an equidigital number, since it uses as much as digits as its factorization.

51571021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 350, while the sum is 22.

The square root of 51571021 is about 7181.2966099445. The cubic root of 51571021 is about 372.2218899166.

Adding to 51571021 its reverse (12017515), we get a palindrome (63588536).

The spelling of 51571021 in words is "fifty-one million, five hundred seventy-one thousand, twenty-one".