153412221 has 4 divisors (see below), whose sum is σ = 204549632. Its totient is φ = 102274812.

The previous prime is 153412187. The next prime is 153412223. The reversal of 153412221 is 122214351.

153412221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is not a de Polignac number, because 153412221 - 2²⁵ = 119857789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (153412223) 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, 25568701 + ... + 25568706.

It is an arithmetic number, because the mean of its divisors is an integer number (51137408).

Almost surely, 2^153412221 is an apocalyptic number.

It is an amenable number.

153412221 is a deficient number, since it is larger than the sum of its proper divisors (51137411).

153412221 is an equidigital number, since it uses as much as digits as its factorization.

153412221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51137410.

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

The square root of 153412221 is about 12385.9687146384. The cubic root of 153412221 is about 535.3280324433.

Adding to 153412221 its reverse (122214351), we get a palindrome (275626572).

The spelling of 153412221 in words is "one hundred fifty-three million, four hundred twelve thousand, two hundred twenty-one".