213010121321 has 4 divisors (see below), whose sum is σ = 213253007172. Its totient is φ = 212767235472.

The previous prime is 213010121309. The next prime is 213010121341. The reversal of 213010121321 is 123121010312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 125748961321 + 87261160000 = 354611^2 + 295400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213010121321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 213010121321.

It is not an unprimeable number, because it can be changed into a prime (213010121341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121441610 + ... + 121443363.

It is an arithmetic number, because the mean of its divisors is an integer number (53313251793).

Almost surely, 2^213010121321 is an apocalyptic number.

It is an amenable number.

213010121321 is a deficient number, since it is larger than the sum of its proper divisors (242885851).

213010121321 is an equidigital number, since it uses as much as digits as its factorization.

213010121321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242885850.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 213010121321 its reverse (123121010312), we get a palindrome (336131131633).

The spelling of 213010121321 in words is "two hundred thirteen billion, ten million, one hundred twenty-one thousand, three hundred twenty-one".