154424221 has 4 divisors (see below), whose sum is σ = 176484832. Its totient is φ = 132363612.

The previous prime is 154424197. The next prime is 154424233. The reversal of 154424221 is 122424451.

154424221 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, and also an emirpimes, since its reverse is a distinct semiprime: 122424451 = 1213 ⋅100927.

It is a cyclic number.

It is not a de Polignac number, because 154424221 - 2⁵ = 154424189 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 (154424261) 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, 11030295 + ... + 11030308.

It is an arithmetic number, because the mean of its divisors is an integer number (44121208).

Almost surely, 2^154424221 is an apocalyptic number.

It is an amenable number.

154424221 is a deficient number, since it is larger than the sum of its proper divisors (22060611).

154424221 is an equidigital number, since it uses as much as digits as its factorization.

154424221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22060610.

The product of its digits is 2560, while the sum is 25.

The square root of 154424221 is about 12426.7542423595. The cubic root of 154424221 is about 536.5025696268.

Adding to 154424221 its reverse (122424451), we get a palindrome (276848672).

The spelling of 154424221 in words is "one hundred fifty-four million, four hundred twenty-four thousand, two hundred twenty-one".