210505345004155 has 4 divisors (see below), whose sum is σ = 252606414004992. Its totient is φ = 168404276003320.

The previous prime is 210505345004063. The next prime is 210505345004239. The reversal of 210505345004155 is 551400543505012.

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

It is not a de Polignac number, because 210505345004155 - 2⁴³ = 201709251981947 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21050534500411 + ... + 21050534500420.

It is an arithmetic number, because the mean of its divisors is an integer number (63151603501248).

Almost surely, 2^{210505345004155} is an apocalyptic number.

210505345004155 is a deficient number, since it is larger than the sum of its proper divisors (42101069000837).

210505345004155 is an equidigital number, since it uses as much as digits as its factorization.

210505345004155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42101069000836.

The product of its (nonzero) digits is 300000, while the sum is 40.

Adding to 210505345004155 its reverse (551400543505012), we get a palindrome (761905888509167).

The spelling of 210505345004155 in words is "two hundred ten trillion, five hundred five billion, three hundred forty-five million, four thousand, one hundred fifty-five".