154138221 has 40 divisors (see below), whose sum is σ = 236373984. Its totient is φ = 100072800.

The previous prime is 154138211. The next prime is 154138247. The reversal of 154138221 is 122831451.

It is not a de Polignac number, because 154138221 - 2⁷ = 154138093 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154138211) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 678910 + ... + 679136.

Almost surely, 2^154138221 is an apocalyptic number.

It is an amenable number.

154138221 is a deficient number, since it is larger than the sum of its proper divisors (82235763).

154138221 is a wasteful number, since it uses less digits than its factorization.

154138221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423 (or 414 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 154138221 is about 12415.2414797297. The cubic root of 154138221 is about 536.1711566807.

Adding to 154138221 its reverse (122831451), we get a palindrome (276969672).

The spelling of 154138221 in words is "one hundred fifty-four million, one hundred thirty-eight thousand, two hundred twenty-one".