212222221221221 has 8 divisors (see below), whose sum is σ = 212254835547744. Its totient is φ = 212189608745200.

The previous prime is 212222221221203. The next prime is 212222221221233. The reversal of 212222221221221 is 122122122222212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212222221221221 - 2²² = 212222217026917 is a prime.

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 (212222221221281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238322210 + ... + 239211036.

It is an arithmetic number, because the mean of its divisors is an integer number (26531854443468).

Almost surely, 2^{212222221221221} is an apocalyptic number.

It is an amenable number.

212222221221221 is a deficient number, since it is larger than the sum of its proper divisors (32614326523).

212222221221221 is an equidigital number, since it uses as much as digits as its factorization.

212222221221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925251.

The product of its digits is 2048, while the sum is 26.

Adding to 212222221221221 its reverse (122122122222212), we get a palindrome (334344343443433).

The spelling of 212222221221221 in words is "two hundred twelve trillion, two hundred twenty-two billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".