213223022111221 has 4 divisors (see below), whose sum is σ = 214154127011500. Its totient is φ = 212291917210944.

The previous prime is 213223022111107. The next prime is 213223022111243. The reversal of 213223022111221 is 122111220322312.

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 182912370740100 + 30310651371121 = 13524510^2 + 5505511^2 .

It is a cyclic number.

It is not a de Polignac number, because 213223022111221 - 2¹⁵ = 213223022078453 is a prime.

It is a super-2 number, since 2×213223022111221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213223022111261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 465552449796 + ... + 465552450253.

It is an arithmetic number, because the mean of its divisors is an integer number (53538531752875).

Almost surely, 2^{213223022111221} is an apocalyptic number.

It is an amenable number.

213223022111221 is a deficient number, since it is larger than the sum of its proper divisors (931104900279).

213223022111221 is an equidigital number, since it uses as much as digits as its factorization.

213223022111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931104900278.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 213223022111221 its reverse (122111220322312), we get a palindrome (335334242433533).

The spelling of 213223022111221 in words is "two hundred thirteen trillion, two hundred twenty-three billion, twenty-two million, one hundred eleven thousand, two hundred twenty-one".