2154105223 has 4 divisors (see below), whose sum is σ = 2156534640. Its totient is φ = 2151675808.

The previous prime is 2154105203. The next prime is 2154105251. The reversal of 2154105223 is 3225014512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2154105223 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 (2154105203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1213378 + ... + 1215151.

It is an arithmetic number, because the mean of its divisors is an integer number (539133660).

Almost surely, 2^2154105223 is an apocalyptic number.

2154105223 is a deficient number, since it is larger than the sum of its proper divisors (2429417).

2154105223 is an equidigital number, since it uses as much as digits as its factorization.

2154105223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2429416.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 2154105223 is about 46412.3391244182. The cubic root of 2154105223 is about 1291.4838248930.

Adding to 2154105223 its reverse (3225014512), we get a palindrome (5379119735).

The spelling of 2154105223 in words is "two billion, one hundred fifty-four million, one hundred five thousand, two hundred twenty-three".