51346021 has 2 divisors, whose sum is σ = 51346022. Its totient is φ = 51346020.

The previous prime is 51346019. The next prime is 51346039. The reversal of 51346021 is 12064315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46444225 + 4901796 = 6815^2 + 2214^2 .

It is a cyclic number.

It is not a de Polignac number, because 51346021 - 2¹ = 51346019 is a prime.

Together with 51346019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 51345983 and 51346001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51346921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25673010 + 25673011.

It is an arithmetic number, because the mean of its divisors is an integer number (25673011).

Almost surely, 2^51346021 is an apocalyptic number.

It is an amenable number.

51346021 is a deficient number, since it is larger than the sum of its proper divisors (1).

51346021 is an equidigital number, since it uses as much as digits as its factorization.

51346021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 51346021 is about 7165.6137908765. The cubic root of 51346021 is about 371.6797765512.

The spelling of 51346021 in words is "fifty-one million, three hundred forty-six thousand, twenty-one".