51022421 has 2 divisors, whose sum is σ = 51022422. Its totient is φ = 51022420.

The previous prime is 51022417. The next prime is 51022427. The reversal of 51022421 is 12422015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26122321 + 24900100 = 5111^2 + 4990^2 .

It is a cyclic number.

It is not a de Polignac number, because 51022421 - 2² = 51022417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a plaindrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 51022421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51022427) 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, 25511210 + 25511211.

It is an arithmetic number, because the mean of its divisors is an integer number (25511211).

Almost surely, 2^51022421 is an apocalyptic number.

It is an amenable number.

51022421 is a deficient number, since it is larger than the sum of its proper divisors (1).

51022421 is an equidigital number, since it uses as much as digits as its factorization.

51022421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 51022421 is about 7142.9980400389. The cubic root of 51022421 is about 370.8973132157.

Adding to 51022421 its reverse (12422015), we get a palindrome (63444436).

The spelling of 51022421 in words is "fifty-one million, twenty-two thousand, four hundred twenty-one".