221321122213 has 4 divisors (see below), whose sum is σ = 222270998508. Its totient is φ = 220371245920.

The previous prime is 221321122207. The next prime is 221321122219. The reversal of 221321122213 is 312221123122.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (221321122207) and next prime (221321122219).

It can be written as a sum of positive squares in 2 ways, for example, as 126023580004 + 95297542209 = 354998^2 + 308703^2 .

It is a cyclic number.

It is not a de Polignac number, because 221321122213 - 2³³ = 212731187621 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 (221321122219) 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, 474937798 + ... + 474938263.

It is an arithmetic number, because the mean of its divisors is an integer number (55567749627).

Almost surely, 2^221321122213 is an apocalyptic number.

It is an amenable number.

221321122213 is a deficient number, since it is larger than the sum of its proper divisors (949876295).

221321122213 is an equidigital number, since it uses as much as digits as its factorization.

221321122213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949876294.

The product of its digits is 576, while the sum is 22.

Adding to 221321122213 its reverse (312221123122), we get a palindrome (533542245335).

Subtracting 221321122213 from its reverse (312221123122), we obtain a palindrome (90900000909).

The spelling of 221321122213 in words is "two hundred twenty-one billion, three hundred twenty-one million, one hundred twenty-two thousand, two hundred thirteen".