350643421 has 2 divisors, whose sum is σ = 350643422. Its totient is φ = 350643420.

The previous prime is 350643401. The next prime is 350643443. The reversal of 350643421 is 124346053.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209960100 + 140683321 = 14490^2 + 11861^2 .

It is a cyclic number.

It is not a de Polignac number, because 350643421 - 2²¹ = 348546269 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 350643421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (350643401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 175321710 + 175321711.

It is an arithmetic number, because the mean of its divisors is an integer number (175321711).

Almost surely, 2^350643421 is an apocalyptic number.

It is an amenable number.

350643421 is a deficient number, since it is larger than the sum of its proper divisors (1).

350643421 is an equidigital number, since it uses as much as digits as its factorization.

350643421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 350643421 is about 18725.4751875620. The cubic root of 350643421 is about 705.1614545632.

Adding to 350643421 its reverse (124346053), we get a palindrome (474989474).

The spelling of 350643421 in words is "three hundred fifty million, six hundred forty-three thousand, four hundred twenty-one".