213120010321 has 4 divisors (see below), whose sum is σ = 216613781044. Its totient is φ = 209626239600.

The previous prime is 213120010319. The next prime is 213120010339. The reversal of 213120010321 is 123010021312.

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 3986659600 + 209133350721 = 63140^2 + 457311^2 .

It is a cyclic number.

It is not a de Polignac number, because 213120010321 - 2¹ = 213120010319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213120010295 and 213120010304.

It is not an unprimeable number, because it can be changed into a prime (213120010391) 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, 1746885270 + ... + 1746885391.

It is an arithmetic number, because the mean of its divisors is an integer number (54153445261).

Almost surely, 2^213120010321 is an apocalyptic number.

It is an amenable number.

213120010321 is a deficient number, since it is larger than the sum of its proper divisors (3493770723).

213120010321 is an equidigital number, since it uses as much as digits as its factorization.

213120010321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3493770722.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 213120010321 its reverse (123010021312), we get a palindrome (336130031633).

The spelling of 213120010321 in words is "two hundred thirteen billion, one hundred twenty million, ten thousand, three hundred twenty-one".