221011211213 has 4 divisors (see below), whose sum is σ = 238012073628. Its totient is φ = 204010348800.

The previous prime is 221011211207. The next prime is 221011211263. The reversal of 221011211213 is 312112110122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 312112110122 = 2 ⋅156056055061.

It can be written as a sum of positive squares in 2 ways, for example, as 72984804649 + 148026406564 = 270157^2 + 384742^2 .

It is a cyclic number.

It is not a de Polignac number, because 221011211213 - 2⁸ = 221011210957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221011211191 and 221011211200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221011211263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8500431188 + ... + 8500431213.

It is an arithmetic number, because the mean of its divisors is an integer number (59503018407).

Almost surely, 2^221011211213 is an apocalyptic number.

It is an amenable number.

221011211213 is a deficient number, since it is larger than the sum of its proper divisors (17000862415).

221011211213 is a wasteful number, since it uses less digits than its factorization.

221011211213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17000862414.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 221011211213 its reverse (312112110122), we get a palindrome (533123321335).

The spelling of 221011211213 in words is "two hundred twenty-one billion, eleven million, two hundred eleven thousand, two hundred thirteen".