211210221222221 has 8 divisors (see below), whose sum is σ = 227728266407040. Its totient is φ = 194730905336112.

The previous prime is 211210221222173. The next prime is 211210221222239. The reversal of 211210221222221 is 122222122012112.

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 211210221222221 - 2⁴⁶ = 140841477044557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211210221224221) 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, 9682313345 + ... + 9682335158.

It is an arithmetic number, because the mean of its divisors is an integer number (28466033300880).

Almost surely, 2^{211210221222221} is an apocalyptic number.

It is an amenable number.

211210221222221 is a deficient number, since it is larger than the sum of its proper divisors (16518045184819).

211210221222221 is a wasteful number, since it uses less digits than its factorization.

211210221222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19364649355.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 211210221222221 its reverse (122222122012112), we get a palindrome (333432343234333).

The spelling of 211210221222221 in words is "two hundred eleven trillion, two hundred ten billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty-one".