22121211100221 has 8 divisors (see below), whose sum is σ = 32772164592960. Its totient is φ = 14747474066796.

The previous prime is 22121211100213. The next prime is 22121211100223. The reversal of 22121211100221 is 12200111212122.

22121211100221 is a `hidden beast` number, since 2 + 212 + 121 + 110 + 0 + 221 = 666.

It is not a de Polignac number, because 22121211100221 - 2³ = 22121211100213 is a prime.

It is a super-3 number, since 3×22121211100221³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22121211100194 and 22121211100203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121211100223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 409652057385 + ... + 409652057438.

It is an arithmetic number, because the mean of its divisors is an integer number (4096520574120).

Almost surely, 2^{22121211100221} is an apocalyptic number.

It is an amenable number.

22121211100221 is a deficient number, since it is larger than the sum of its proper divisors (10650953492739).

22121211100221 is an equidigital number, since it uses as much as digits as its factorization.

22121211100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819304114832 (or 819304114826 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 22121211100221 its reverse (12200111212122), we get a palindrome (34321322312343).

The spelling of 22121211100221 in words is "twenty-two trillion, one hundred twenty-one billion, two hundred eleven million, one hundred thousand, two hundred twenty-one".