154230221 has 4 divisors (see below), whose sum is σ = 154327452. Its totient is φ = 154132992.

The previous prime is 154230191. The next prime is 154230227. The reversal of 154230221 is 122032451.

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 63027721 + 91202500 = 7939^2 + 9550^2 .

It is a cyclic number.

It is not a de Polignac number, because 154230221 - 2¹⁴ = 154213837 is a prime.

It is a super-2 number, since 2×154230221² = 47573922139417682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 154230193 and 154230202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154230227) 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, 46196 + ... + 49421.

It is an arithmetic number, because the mean of its divisors is an integer number (38581863).

Almost surely, 2^154230221 is an apocalyptic number.

It is an amenable number.

154230221 is a deficient number, since it is larger than the sum of its proper divisors (97231).

154230221 is an equidigital number, since it uses as much as digits as its factorization.

154230221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97230.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 154230221 is about 12418.9460502895. The cubic root of 154230221 is about 536.2778097339.

Adding to 154230221 its reverse (122032451), we get a palindrome (276262672).

It can be divided in two parts, 154230 and 221, that added together give a palindrome (154451).

The spelling of 154230221 in words is "one hundred fifty-four million, two hundred thirty thousand, two hundred twenty-one".