221133211213 has 4 divisors (see below), whose sum is σ = 223161956380. Its totient is φ = 219104466048.

The previous prime is 221133211193. The next prime is 221133211223. The reversal of 221133211213 is 312112331122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 312112331122 = 2 ⋅156056165561.

It can be written as a sum of positive squares in 2 ways, for example, as 174575223684 + 46557987529 = 417822^2 + 215773^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221133211213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221133211223) 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, 1014372420 + ... + 1014372637.

It is an arithmetic number, because the mean of its divisors is an integer number (55790489095).

Almost surely, 2^221133211213 is an apocalyptic number.

It is an amenable number.

221133211213 is a deficient number, since it is larger than the sum of its proper divisors (2028745167).

221133211213 is a wasteful number, since it uses less digits than its factorization.

221133211213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2028745166.

The product of its digits is 432, while the sum is 22.

Adding to 221133211213 its reverse (312112331122), we get a palindrome (533245542335).

The spelling of 221133211213 in words is "two hundred twenty-one billion, one hundred thirty-three million, two hundred eleven thousand, two hundred thirteen".