154045021 has 12 divisors (see below), whose sum is σ = 168543732. Its totient is φ = 140714496.

The previous prime is 154045009. The next prime is 154045057. The reversal of 154045021 is 120540451.

154045021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 75012921 + 79032100 = 8661^2 + 8890^2 .

It is not a de Polignac number, because 154045021 - 2¹³ = 154036829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 154044983 and 154045001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154045091) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11695 + ... + 21091.

It is an arithmetic number, because the mean of its divisors is an integer number (14045311).

Almost surely, 2^154045021 is an apocalyptic number.

It is an amenable number.

154045021 is a deficient number, since it is larger than the sum of its proper divisors (14498711).

154045021 is an equidigital number, since it uses as much as digits as its factorization.

154045021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9520 (or 9507 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 154045021 is about 12411.4874612191. The cubic root of 154045021 is about 536.0630692196.

Adding to 154045021 its reverse (120540451), we get a palindrome (274585472).

The spelling of 154045021 in words is "one hundred fifty-four million, forty-five thousand, twenty-one".