211222202100221 has 8 divisors (see below), whose sum is σ = 227470339982424. Its totient is φ = 194974103672640.

The previous prime is 211222202100199. The next prime is 211222202100223. The reversal of 211222202100221 is 122001202222112.

It can be written as a sum of positive squares in 4 ways, for example, as 583712808121 + 210638489292100 = 764011^2 + 14513390^2 .

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 211222202100221 - 2⁶ = 211222202100157 is a prime.

It is a super-2 number, since 2×211222202100221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211222202100193 and 211222202100202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211222202100223) 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, 1762835 + ... + 20628911.

It is an arithmetic number, because the mean of its divisors is an integer number (28433792497803).

Almost surely, 2^{211222202100221} is an apocalyptic number.

It is an amenable number.

211222202100221 is a deficient number, since it is larger than the sum of its proper divisors (16248137882203).

211222202100221 is a wasteful number, since it uses less digits than its factorization.

211222202100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19727311.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 211222202100221 its reverse (122001202222112), we get a palindrome (333223404322333).

The spelling of 211222202100221 in words is "two hundred eleven trillion, two hundred twenty-two billion, two hundred two million, one hundred thousand, two hundred twenty-one".