213111112321 has 2 divisors, whose sum is σ = 213111112322. Its totient is φ = 213111112320.

The previous prime is 213111112301. The next prime is 213111112339. The reversal of 213111112321 is 123211111312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160160040000 + 52951072321 = 400200^2 + 230111^2 .

It is a cyclic number.

It is not a de Polignac number, because 213111112321 - 2¹⁷ = 213110981249 is a prime.

It is not a weakly prime, because it can be changed into another prime (213111112301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106555556160 + 106555556161.

It is an arithmetic number, because the mean of its divisors is an integer number (106555556161).

Almost surely, 2^213111112321 is an apocalyptic number.

It is an amenable number.

213111112321 is a deficient number, since it is larger than the sum of its proper divisors (1).

213111112321 is an equidigital number, since it uses as much as digits as its factorization.

213111112321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 19.

Adding to 213111112321 its reverse (123211111312), we get a palindrome (336322223633).

The spelling of 213111112321 in words is "two hundred thirteen billion, one hundred eleven million, one hundred twelve thousand, three hundred twenty-one".