221122211230213 has 4 divisors (see below), whose sum is σ = 223079044958028. Its totient is φ = 219165377502400.

The previous prime is 221122211230199. The next prime is 221122211230223. The reversal of 221122211230213 is 312032112221122.

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 8901618339364 + 212220592890849 = 2983558^2 + 14567793^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221122211230213 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 (221122211230223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 978416863738 + ... + 978416863963.

It is an arithmetic number, because the mean of its divisors is an integer number (55769761239507).

Almost surely, 2^{221122211230213} is an apocalyptic number.

It is an amenable number.

221122211230213 is a deficient number, since it is larger than the sum of its proper divisors (1956833727815).

221122211230213 is a wasteful number, since it uses less digits than its factorization.

221122211230213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1956833727814.

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

Adding to 221122211230213 its reverse (312032112221122), we get a palindrome (533154323451335).

Subtracting 221122211230213 from its reverse (312032112221122), we obtain a palindrome (90909900990909).

The spelling of 221122211230213 in words is "two hundred twenty-one trillion, one hundred twenty-two billion, two hundred eleven million, two hundred thirty thousand, two hundred thirteen".