354621221 has 2 divisors, whose sum is σ = 354621222. Its totient is φ = 354621220.

The previous prime is 354621203. The next prime is 354621227. The reversal of 354621221 is 122126453.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199120321 + 155500900 = 14111^2 + 12470^2 .

It is a cyclic number.

It is not a de Polignac number, because 354621221 - 2¹⁰ = 354620197 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (354621227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 177310610 + 177310611.

It is an arithmetic number, because the mean of its divisors is an integer number (177310611).

Almost surely, 2^354621221 is an apocalyptic number.

It is an amenable number.

354621221 is a deficient number, since it is larger than the sum of its proper divisors (1).

354621221 is an equidigital number, since it uses as much as digits as its factorization.

354621221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 26.

The square root of 354621221 is about 18831.3892477427. The cubic root of 354621221 is about 707.8179526251.

Adding to 354621221 its reverse (122126453), we get a palindrome (476747674).

The spelling of 354621221 in words is "three hundred fifty-four million, six hundred twenty-one thousand, two hundred twenty-one".