215451321155 has 16 divisors (see below), whose sum is σ = 295493163264. Its totient is φ = 147729516000.

The previous prime is 215451321149. The next prime is 215451321191. The reversal of 215451321155 is 551123154512.

It is not a de Polignac number, because 215451321155 - 2⁴ = 215451321139 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 470144 + ... + 807426.

It is an arithmetic number, because the mean of its divisors is an integer number (18468322704).

Almost surely, 2^215451321155 is an apocalyptic number.

215451321155 is a deficient number, since it is larger than the sum of its proper divisors (80041842109).

215451321155 is a wasteful number, since it uses less digits than its factorization.

215451321155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355546.

The product of its digits is 30000, while the sum is 35.

Adding to 215451321155 its reverse (551123154512), we get a palindrome (766574475667).

The spelling of 215451321155 in words is "two hundred fifteen billion, four hundred fifty-one million, three hundred twenty-one thousand, one hundred fifty-five".