221121233213 has 2 divisors, whose sum is σ = 221121233214. Its totient is φ = 221121233212.

The previous prime is 221121233209. The next prime is 221121233227. The reversal of 221121233213 is 312332121122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163618632004 + 57502601209 = 404498^2 + 239797^2 .

It is a cyclic number.

It is not a de Polignac number, because 221121233213 - 2² = 221121233209 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221121235213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110560616606 + 110560616607.

It is an arithmetic number, because the mean of its divisors is an integer number (110560616607).

Almost surely, 2^221121233213 is an apocalyptic number.

It is an amenable number.

221121233213 is a deficient number, since it is larger than the sum of its proper divisors (1).

221121233213 is an equidigital number, since it uses as much as digits as its factorization.

221121233213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 23.

Adding to 221121233213 its reverse (312332121122), we get a palindrome (533453354335).

The spelling of 221121233213 in words is "two hundred twenty-one billion, one hundred twenty-one million, two hundred thirty-three thousand, two hundred thirteen".