50431021 has 4 divisors (see below), whose sum is σ = 50449500. Its totient is φ = 50412544.

The previous prime is 50431009. The next prime is 50431033. The reversal of 50431021 is 12013405.

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

It is an interprime number because it is at equal distance from previous prime (50431009) and next prime (50431033).

It can be written as a sum of positive squares in 2 ways, for example, as 27678121 + 22752900 = 5261^2 + 4770^2 .

It is a cyclic number.

It is not a de Polignac number, because 50431021 - 2⁹ = 50430509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 50430986 and 50431004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50431081) 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, 4246 + ... + 10903.

It is an arithmetic number, because the mean of its divisors is an integer number (12612375).

Almost surely, 2^50431021 is an apocalyptic number.

It is an amenable number.

50431021 is a deficient number, since it is larger than the sum of its proper divisors (18479).

50431021 is a wasteful number, since it uses less digits than its factorization.

50431021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18478.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 50431021 is about 7101.4801978179. The cubic root of 50431021 is about 369.4587191265.

Adding to 50431021 its reverse (12013405), we get a palindrome (62444426).

The spelling of 50431021 in words is "fifty million, four hundred thirty-one thousand, twenty-one".