154421021 has 8 divisors (see below), whose sum is σ = 156533688. Its totient is φ = 152320000.

The previous prime is 154420967. The next prime is 154421023. The reversal of 154421021 is 120124451.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 93799225 + 60621796 = 9685^2 + 7786^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 154421021 - 2⁶ = 154420957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 154420984 and 154421002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154421023) 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 7 ways as a sum of consecutive naturals, for example, 25661 + ... + 31101.

It is an arithmetic number, because the mean of its divisors is an integer number (19566711).

Almost surely, 2^154421021 is an apocalyptic number.

It is an amenable number.

154421021 is a deficient number, since it is larger than the sum of its proper divisors (2112667).

154421021 is a wasteful number, since it uses less digits than its factorization.

154421021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5823.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 154421021 is about 12426.6254872351. The cubic root of 154421021 is about 536.4988637744.

Adding to 154421021 its reverse (120124451), we get a palindrome (274545472).

The spelling of 154421021 in words is "one hundred fifty-four million, four hundred twenty-one thousand, twenty-one".