213120212321 has 4 divisors (see below), whose sum is σ = 214050868500. Its totient is φ = 212189556144.

The previous prime is 213120212317. The next prime is 213120212323. The reversal of 213120212321 is 123212021312.

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 202698048400 + 10422163921 = 450220^2 + 102089^2 .

It is a cyclic number.

It is not a de Polignac number, because 213120212321 - 2² = 213120212317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213120212293 and 213120212302.

It is not an unprimeable number, because it can be changed into a prime (213120212323) 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, 465327746 + ... + 465328203.

It is an arithmetic number, because the mean of its divisors is an integer number (53512717125).

Almost surely, 2^213120212321 is an apocalyptic number.

It is an amenable number.

213120212321 is a deficient number, since it is larger than the sum of its proper divisors (930656179).

213120212321 is an equidigital number, since it uses as much as digits as its factorization.

213120212321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930656178.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 213120212321 its reverse (123212021312), we get a palindrome (336332233633).

The spelling of 213120212321 in words is "two hundred thirteen billion, one hundred twenty million, two hundred twelve thousand, three hundred twenty-one".