212213133221 has 4 divisors (see below), whose sum is σ = 219530827500. Its totient is φ = 204895438944.

The previous prime is 212213133179. The next prime is 212213133257. The reversal of 212213133221 is 122331312212.

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 40759168321 + 171453964900 = 201889^2 + 414070^2 .

It is a cyclic number.

It is not a de Polignac number, because 212213133221 - 2²² = 212208938917 is a prime.

It is a super-2 number, since 2×212213133221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212213133281) 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, 3658847096 + ... + 3658847153.

It is an arithmetic number, because the mean of its divisors is an integer number (54882706875).

Almost surely, 2^212213133221 is an apocalyptic number.

It is an amenable number.

212213133221 is a deficient number, since it is larger than the sum of its proper divisors (7317694279).

212213133221 is an equidigital number, since it uses as much as digits as its factorization.

212213133221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7317694278.

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

Adding to 212213133221 its reverse (122331312212), we get a palindrome (334544445433).

The spelling of 212213133221 in words is "two hundred twelve billion, two hundred thirteen million, one hundred thirty-three thousand, two hundred twenty-one".