354211221 has 16 divisors (see below), whose sum is σ = 581270144. Its totient is φ = 186836544.

The previous prime is 354211217. The next prime is 354211229. The reversal of 354211221 is 122112453.

It is not a de Polignac number, because 354211221 - 2² = 354211217 is a prime.

It is a super-3 number, since 3×354211221³ (a number of 27 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is the 18821-st Hogben number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (354211229) by changing a digit.

It is a nontrivial repunit in base 18820.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 648466 + ... + 649011.

It is an arithmetic number, because the mean of its divisors is an integer number (36329384).

Almost surely, 2^354211221 is an apocalyptic number.

It is an amenable number.

354211221 is a deficient number, since it is larger than the sum of its proper divisors (227058923).

354211221 is a wasteful number, since it uses less digits than its factorization.

354211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1297500.

The product of its digits is 480, while the sum is 21.

The square root of 354211221 is about 18820.5000199251. The cubic root of 354211221 is about 707.5450630772.

Adding to 354211221 its reverse (122112453), we get a palindrome (476323674).

It can be divided in two parts, 354 and 211221, that added together give a triangular number (211575 = T₆₅₀).

The spelling of 354211221 in words is "three hundred fifty-four million, two hundred eleven thousand, two hundred twenty-one".