345100221 has 24 divisors (see below), whose sum is σ = 542074104. Its totient is φ = 210677760.

The previous prime is 345100219. The next prime is 345100229. The reversal of 345100221 is 122001543.

345100221 is a `hidden beast` number, since 345 + 100 + 221 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 54022500 + 291077721 = 7350^2 + 17061^2 .

It is not a de Polignac number, because 345100221 - 2¹ = 345100219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 345100194 and 345100203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345100229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24820 + ... + 36141.

It is an arithmetic number, because the mean of its divisors is an integer number (22586421).

Almost surely, 2^345100221 is an apocalyptic number.

It is an amenable number.

345100221 is a deficient number, since it is larger than the sum of its proper divisors (196973883).

345100221 is a wasteful number, since it uses less digits than its factorization.

345100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61021 (or 61018 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 345100221 is about 18576.8732837364. The cubic root of 345100221 is about 701.4258155825.

Adding to 345100221 its reverse (122001543), we get a palindrome (467101764).

The spelling of 345100221 in words is "three hundred forty-five million, one hundred thousand, two hundred twenty-one".