154108021 has 4 divisors (see below), whose sum is σ = 156634444. Its totient is φ = 151581600.

The previous prime is 154108013. The next prime is 154108051. The reversal of 154108021 is 120801451.

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 4901796 + 149206225 = 2214^2 + 12215^2 .

It is a cyclic number.

It is not a de Polignac number, because 154108021 - 2³ = 154108013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 154107983 and 154108001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154108051) 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, 1263120 + ... + 1263241.

It is an arithmetic number, because the mean of its divisors is an integer number (39158611).

Almost surely, 2^154108021 is an apocalyptic number.

It is an amenable number.

154108021 is a deficient number, since it is larger than the sum of its proper divisors (2526423).

154108021 is an equidigital number, since it uses as much as digits as its factorization.

154108021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2526422.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 154108021 is about 12414.0251731660. The cubic root of 154108021 is about 536.1361374051.

Adding to 154108021 its reverse (120801451), we get a palindrome (274909472).

The spelling of 154108021 in words is "one hundred fifty-four million, one hundred eight thousand, twenty-one".