213255665321 has 4 divisors (see below), whose sum is σ = 213476199552. Its totient is φ = 213035131092.

The previous prime is 213255665297. The next prime is 213255665339. The reversal of 213255665321 is 123566552312.

213255665321 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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213255665321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213255661321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110265665 + ... + 110267598.

It is an arithmetic number, because the mean of its divisors is an integer number (53369049888).

Almost surely, 2^213255665321 is an apocalyptic number.

It is an amenable number.

213255665321 is a deficient number, since it is larger than the sum of its proper divisors (220534231).

213255665321 is an equidigital number, since it uses as much as digits as its factorization.

213255665321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220534230.

The product of its digits is 324000, while the sum is 41.

The spelling of 213255665321 in words is "two hundred thirteen billion, two hundred fifty-five million, six hundred sixty-five thousand, three hundred twenty-one".