354206221 has 2 divisors, whose sum is σ = 354206222. Its totient is φ = 354206220.

The previous prime is 354206219. The next prime is 354206243. The reversal of 354206221 is 122602453.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 230128900 + 124077321 = 15170^2 + 11139^2 .

It is a cyclic number.

It is not a de Polignac number, because 354206221 - 2¹ = 354206219 is a prime.

It is a super-3 number, since 3×354206221³ (a number of 27 digits) contains 333 as substring.

Together with 354206219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (354206521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 177103110 + 177103111.

It is an arithmetic number, because the mean of its divisors is an integer number (177103111).

Almost surely, 2^354206221 is an apocalyptic number.

It is an amenable number.

354206221 is a deficient number, since it is larger than the sum of its proper divisors (1).

354206221 is an equidigital number, since it uses as much as digits as its factorization.

354206221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 354206221 is about 18820.3671855785. The cubic root of 354206221 is about 707.5417338565.

Adding to 354206221 its reverse (122602453), we get a palindrome (476808674).

The spelling of 354206221 in words is "three hundred fifty-four million, two hundred six thousand, two hundred twenty-one".