50420021 has 4 divisors (see below), whose sum is σ = 50882700. Its totient is φ = 49957344.

The previous prime is 50420003. The next prime is 50420023. The reversal of 50420021 is 12002405.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12002405 = 5 ⋅2400481.

It can be written as a sum of positive squares in 2 ways, for example, as 45711121 + 4708900 = 6761^2 + 2170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50420021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 50419978 and 50420005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50420023) 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, 231176 + ... + 231393.

It is an arithmetic number, because the mean of its divisors is an integer number (12720675).

Almost surely, 2^50420021 is an apocalyptic number.

It is an amenable number.

50420021 is a deficient number, since it is larger than the sum of its proper divisors (462679).

50420021 is a wasteful number, since it uses less digits than its factorization.

50420021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462678.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 50420021 is about 7100.7056691571. The cubic root of 50420021 is about 369.4318550962.

Adding to 50420021 its reverse (12002405), we get a palindrome (62422426).

The spelling of 50420021 in words is "fifty million, four hundred twenty thousand, twenty-one".