353402221 has 4 divisors (see below), whose sum is σ = 354311100. Its totient is φ = 352493344.

The previous prime is 353402209. The next prime is 353402249. The reversal of 353402221 is 122204353.

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 168714121 + 184688100 = 12989^2 + 13590^2 .

It is a cyclic number.

It is not a de Polignac number, because 353402221 - 2¹⁹ = 352877933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 353402192 and 353402201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (353402321) 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, 453856 + ... + 454633.

It is an arithmetic number, because the mean of its divisors is an integer number (88577775).

Almost surely, 2^353402221 is an apocalyptic number.

It is an amenable number.

353402221 is a deficient number, since it is larger than the sum of its proper divisors (908879).

353402221 is an equidigital number, since it uses as much as digits as its factorization.

353402221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908878.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 353402221 is about 18798.9952125107. The cubic root of 353402221 is about 707.0059870907.

Adding to 353402221 its reverse (122204353), we get a palindrome (475606574).

The spelling of 353402221 in words is "three hundred fifty-three million, four hundred two thousand, two hundred twenty-one".