153240221 has 4 divisors (see below), whose sum is σ = 153409344. Its totient is φ = 153071100.

The previous prime is 153240203. The next prime is 153240251. The reversal of 153240221 is 122042351.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122042351 = 131 ⋅931621.

It is a cyclic number.

It is not a de Polignac number, because 153240221 - 2¹⁰ = 153239197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 153240193 and 153240202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (153240251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83195 + ... + 85016.

It is an arithmetic number, because the mean of its divisors is an integer number (38352336).

Almost surely, 2^153240221 is an apocalyptic number.

It is an amenable number.

153240221 is a deficient number, since it is larger than the sum of its proper divisors (169123).

153240221 is an equidigital number, since it uses as much as digits as its factorization.

153240221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169122.

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

The square root of 153240221 is about 12379.0234267490. The cubic root of 153240221 is about 535.1278944245.

Adding to 153240221 its reverse (122042351), we get a palindrome (275282572).

The spelling of 153240221 in words is "one hundred fifty-three million, two hundred forty thousand, two hundred twenty-one".