50405021 has 2 divisors, whose sum is σ = 50405022. Its totient is φ = 50405020.

The previous prime is 50404999. The next prime is 50405041. The reversal of 50405021 is 12050405.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45292900 + 5112121 = 6730^2 + 2261^2 .

It is a cyclic number.

It is not a de Polignac number, because 50405021 - 2⁶ = 50404957 is a prime.

It is a super-2 number, since 2×50405021² = 5081332284020882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50405041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25202510 + 25202511.

It is an arithmetic number, because the mean of its divisors is an integer number (25202511).

Almost surely, 2^50405021 is an apocalyptic number.

It is an amenable number.

50405021 is a deficient number, since it is larger than the sum of its proper divisors (1).

50405021 is an equidigital number, since it uses as much as digits as its factorization.

50405021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 50405021 is about 7099.6493575387. The cubic root of 50405021 is about 369.3952160301.

Adding to 50405021 its reverse (12050405), we get a palindrome (62455426).

The spelling of 50405021 in words is "fifty million, four hundred five thousand, twenty-one".