211022201221 has 4 divisors (see below), whose sum is σ = 227254678252. Its totient is φ = 194789724192.

The previous prime is 211022201207. The next prime is 211022201227. The reversal of 211022201221 is 122102220112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 131416400196 + 79605801025 = 362514^2 + 282145^2 .

It is a cyclic number.

It is not a de Polignac number, because 211022201221 - 2¹¹ = 211022199173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211022201195 and 211022201204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211022201227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8116238496 + ... + 8116238521.

It is an arithmetic number, because the mean of its divisors is an integer number (56813669563).

Almost surely, 2^211022201221 is an apocalyptic number.

It is an amenable number.

211022201221 is a deficient number, since it is larger than the sum of its proper divisors (16232477031).

211022201221 is a wasteful number, since it uses less digits than its factorization.

211022201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16232477030.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 211022201221 its reverse (122102220112), we get a palindrome (333124421333).

The spelling of 211022201221 in words is "two hundred eleven billion, twenty-two million, two hundred one thousand, two hundred twenty-one".