154422221 has 4 divisors (see below), whose sum is σ = 155638272. Its totient is φ = 153206172.

The previous prime is 154422211. The next prime is 154422227. The reversal of 154422221 is 122224451.

154422221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122224451 = 1723 ⋅70937.

It is a cyclic number.

It is not a de Polignac number, because 154422221 - 2¹⁸ = 154160077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154422227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 607835 + ... + 608088.

It is an arithmetic number, because the mean of its divisors is an integer number (38909568).

Almost surely, 2^154422221 is an apocalyptic number.

It is an amenable number.

154422221 is a deficient number, since it is larger than the sum of its proper divisors (1216051).

154422221 is a wasteful number, since it uses less digits than its factorization.

154422221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1216050.

The product of its digits is 1280, while the sum is 23.

The square root of 154422221 is about 12426.6737705631. The cubic root of 154422221 is about 536.5002534751.

Adding to 154422221 its reverse (122224451), we get a palindrome (276646672).

The spelling of 154422221 in words is "one hundred fifty-four million, four hundred twenty-two thousand, two hundred twenty-one".