50000021 has 2 divisors, whose sum is σ = 50000022. Its totient is φ = 50000020.

The previous prime is 50000017. The next prime is 50000047. The reversal of 50000021 is 12000005.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49420900 + 579121 = 7030^2 + 761^2 .

It is a cyclic number.

It is not a de Polignac number, because 50000021 - 2² = 50000017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 49999963 and 50000008.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50000221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25000010 + 25000011.

It is an arithmetic number, because the mean of its divisors is an integer number (25000011).

Almost surely, 2^50000021 is an apocalyptic number.

It is an amenable number.

50000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

50000021 is an equidigital number, since it uses as much as digits as its factorization.

50000021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10, while the sum is 8.

The square root of 50000021 is about 7071.0692967896. The cubic root of 50000021 is about 368.4032014405.

Adding to 50000021 its reverse (12000005), we get a palindrome (62000026).

The spelling of 50000021 in words is "fifty million, twenty-one", and thus it is an aban number and an uban number.