212221101 has 8 divisors (see below), whose sum is σ = 292718880. Its totient is φ = 136602032.

The previous prime is 212221067. The next prime is 212221153. The reversal of 212221101 is 101122212.

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 212221101 - 2⁷ = 212220973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212221181) 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, 1219575 + ... + 1219748.

It is an arithmetic number, because the mean of its divisors is an integer number (36589860).

Almost surely, 2^212221101 is an apocalyptic number.

It is an amenable number.

212221101 is a deficient number, since it is larger than the sum of its proper divisors (80497779).

212221101 is a wasteful number, since it uses less digits than its factorization.

212221101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2439355.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 212221101 is about 14567.8104394586. The cubic root of 212221101 is about 596.4804140044.

Adding to 212221101 its reverse (101122212), we get a palindrome (313343313).

The spelling of 212221101 in words is "two hundred twelve million, two hundred twenty-one thousand, one hundred one".