221000321213 has 6 divisors (see below), whose sum is σ = 257082006366. Its totient is φ = 189428846712.

The previous prime is 221000321209. The next prime is 221000321233. The reversal of 221000321213 is 312123000122.

It can be written as a sum of positive squares in only one way, i.e., 193827106564 + 27173214649 = 440258^2 + 164843^2 .

It is not a de Polignac number, because 221000321213 - 2² = 221000321209 is a prime.

It is a super-2 number, since 2×221000321213² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221000321191 and 221000321200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221000321203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2255105270 + ... + 2255105367.

It is an arithmetic number, because the mean of its divisors is an integer number (42847001061).

Almost surely, 2^221000321213 is an apocalyptic number.

It is an amenable number.

221000321213 is a deficient number, since it is larger than the sum of its proper divisors (36081685153).

221000321213 is an equidigital number, since it uses as much as digits as its factorization.

221000321213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4510210651 (or 4510210644 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 221000321213 its reverse (312123000122), we get a palindrome (533123321335).

The spelling of 221000321213 in words is "two hundred twenty-one billion, three hundred twenty-one thousand, two hundred thirteen".