154120221 has 12 divisors (see below), whose sum is σ = 226268380. Its totient is φ = 101062080.

The previous prime is 154120201. The next prime is 154120259. The reversal of 154120221 is 122021451.

154120221 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 2 ways, for example, as 7371225 + 146748996 = 2715^2 + 12114^2 .

It is a de Polignac number, because none of the positive numbers 2^k-154120221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 154120194 and 154120203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154120201) 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, 139816 + ... + 140913.

Almost surely, 2^154120221 is an apocalyptic number.

It is an amenable number.

154120221 is a deficient number, since it is larger than the sum of its proper divisors (72148159).

154120221 is a wasteful number, since it uses less digits than its factorization.

154120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280796 (or 280793 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 154120221 is about 12414.5165431442. The cubic root of 154120221 is about 536.1502848155.

Adding to 154120221 its reverse (122021451), we get a palindrome (276141672).

The spelling of 154120221 in words is "one hundred fifty-four million, one hundred twenty thousand, two hundred twenty-one".