50440021 has 4 divisors (see below), whose sum is σ = 50478444. Its totient is φ = 50401600.

The previous prime is 50440009. The next prime is 50440031. The reversal of 50440021 is 12004405.

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 27772900 + 22667121 = 5270^2 + 4761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50440021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 50439977 and 50440004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50440001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17170 + ... + 19891.

It is an arithmetic number, because the mean of its divisors is an integer number (12619611).

Almost surely, 2^50440021 is an apocalyptic number.

It is an amenable number.

50440021 is a deficient number, since it is larger than the sum of its proper divisors (38423).

50440021 is a wasteful number, since it uses less digits than its factorization.

50440021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38422.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 50440021 is about 7102.1138402591. The cubic root of 50440021 is about 369.4806958822.

Adding to 50440021 its reverse (12004405), we get a palindrome (62444426).

The spelling of 50440021 in words is "fifty million, four hundred forty thousand, twenty-one".