50816021 has 4 divisors (see below), whose sum is σ = 50844972. Its totient is φ = 50787072.

The previous prime is 50815997. The next prime is 50816041. The reversal of 50816021 is 12061805.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28622500 + 22193521 = 5350^2 + 4711^2 .

It is a cyclic number.

It is not a de Polignac number, because 50816021 - 2²² = 46621717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50816041) 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 in 3 ways as a sum of consecutive naturals, for example, 11660 + ... + 15413.

It is an arithmetic number, because the mean of its divisors is an integer number (12711243).

Almost surely, 2^50816021 is an apocalyptic number.

It is an amenable number.

50816021 is a deficient number, since it is larger than the sum of its proper divisors (28951).

50816021 is a wasteful number, since it uses less digits than its factorization.

50816021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28950.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 50816021 is about 7128.5356841360. The cubic root of 50816021 is about 370.3965094321.

Adding to 50816021 its reverse (12061805), we get a palindrome (62877826).

The spelling of 50816021 in words is "fifty million, eight hundred sixteen thousand, twenty-one".