221834911213 has 4 divisors (see below), whose sum is σ = 229484390940. Its totient is φ = 214185431488.

The previous prime is 221834911147. The next prime is 221834911223. The reversal of 221834911213 is 312119438122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 312119438122 = 2 ⋅156059719061.

It can be written as a sum of positive squares in 2 ways, for example, as 132264597124 + 89570314089 = 363682^2 + 299283^2 .

It is a cyclic number.

It is not a de Polignac number, because 221834911213 - 2²⁵ = 221801356781 is a prime.

It is a super-3 number, since 3×221834911213³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221834911223) 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, 3824739820 + ... + 3824739877.

It is an arithmetic number, because the mean of its divisors is an integer number (57371097735).

Almost surely, 2^221834911213 is an apocalyptic number.

It is an amenable number.

221834911213 is a deficient number, since it is larger than the sum of its proper divisors (7649479727).

221834911213 is an equidigital number, since it uses as much as digits as its factorization.

221834911213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7649479726.

The product of its digits is 20736, while the sum is 37.

The spelling of 221834911213 in words is "two hundred twenty-one billion, eight hundred thirty-four million, nine hundred eleven thousand, two hundred thirteen".