350243821 has 4 divisors (see below), whose sum is σ = 351773500. Its totient is φ = 348714144.

The previous prime is 350243807. The next prime is 350243837. The reversal of 350243821 is 128342053.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 128342053 = 7 ⋅18334579.

It can be written as a sum of positive squares in 2 ways, for example, as 145467721 + 204776100 = 12061^2 + 14310^2 .

It is a cyclic number.

It is not a de Polignac number, because 350243821 - 2⁷ = 350243693 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 350243821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (350246821) 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, 764496 + ... + 764953.

It is an arithmetic number, because the mean of its divisors is an integer number (87943375).

Almost surely, 2^350243821 is an apocalyptic number.

It is an amenable number.

350243821 is a deficient number, since it is larger than the sum of its proper divisors (1529679).

350243821 is a wasteful number, since it uses less digits than its factorization.

350243821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1529678.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 350243821 is about 18714.8021897107. The cubic root of 350243821 is about 704.8934808804.

Adding to 350243821 its reverse (128342053), we get a palindrome (478585874).

The spelling of 350243821 in words is "three hundred fifty million, two hundred forty-three thousand, eight hundred twenty-one".