350420821 has 4 divisors (see below), whose sum is σ = 359891692. Its totient is φ = 340949952.

The previous prime is 350420761. The next prime is 350420843. The reversal of 350420821 is 128024053.

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 318622500 + 31798321 = 17850^2 + 5639^2 .

It is a cyclic number.

It is not a de Polignac number, because 350420821 - 2⁹ = 350420309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (350420321) 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, 4735380 + ... + 4735453.

It is an arithmetic number, because the mean of its divisors is an integer number (89972923).

Almost surely, 2^350420821 is an apocalyptic number.

It is an amenable number.

350420821 is a deficient number, since it is larger than the sum of its proper divisors (9470871).

350420821 is an equidigital number, since it uses as much as digits as its factorization.

350420821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9470870.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 350420821 is about 18719.5304695390. The cubic root of 350420821 is about 705.0122030649.

Adding to 350420821 its reverse (128024053), we get a palindrome (478444874).

The spelling of 350420821 in words is "three hundred fifty million, four hundred twenty thousand, eight hundred twenty-one".