154605220221 has 4 divisors (see below), whose sum is σ = 206140293632. Its totient is φ = 103070146812.

The previous prime is 154605220201. The next prime is 154605220247. The reversal of 154605220221 is 122022506451.

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.

It is not a de Polignac number, because 154605220221 - 2⁹ = 154605219709 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 (154605220201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25767536701 + ... + 25767536706.

It is an arithmetic number, because the mean of its divisors is an integer number (51535073408).

Almost surely, 2^154605220221 is an apocalyptic number.

It is an amenable number.

154605220221 is a deficient number, since it is larger than the sum of its proper divisors (51535073411).

154605220221 is an equidigital number, since it uses as much as digits as its factorization.

154605220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51535073410.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 154605220221 its reverse (122022506451), we get a palindrome (276627726672).

The spelling of 154605220221 in words is "one hundred fifty-four billion, six hundred five million, two hundred twenty thousand, two hundred twenty-one".