154232021 has 4 divisors (see below), whose sum is σ = 158400492. Its totient is φ = 150063552.

The previous prime is 154232017. The next prime is 154232027. The reversal of 154232021 is 120232451.

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 144240100 + 9991921 = 12010^2 + 3161^2 .

It is a cyclic number.

It is not a de Polignac number, because 154232021 - 2² = 154232017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 154231984 and 154232002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154232027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2084180 + ... + 2084253.

It is an arithmetic number, because the mean of its divisors is an integer number (39600123).

Almost surely, 2^154232021 is an apocalyptic number.

It is an amenable number.

154232021 is a deficient number, since it is larger than the sum of its proper divisors (4168471).

154232021 is an equidigital number, since it uses as much as digits as its factorization.

154232021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4168470.

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

The square root of 154232021 is about 12419.0185199959. The cubic root of 154232021 is about 536.2798960010.

Adding to 154232021 its reverse (120232451), we get a palindrome (274464472).

The spelling of 154232021 in words is "one hundred fifty-four million, two hundred thirty-two thousand, twenty-one".