211202220221 has 16 divisors (see below), whose sum is σ = 234236116224. Its totient is φ = 189412971264.

The previous prime is 211202220197. The next prime is 211202220247. The reversal of 211202220221 is 122022202112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 211202220221 - 2³⁴ = 194022351037 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 211202220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211202229221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 924086 + ... + 1129751.

It is an arithmetic number, because the mean of its divisors is an integer number (14639757264).

Almost surely, 2^211202220221 is an apocalyptic number.

It is an amenable number.

211202220221 is a deficient number, since it is larger than the sum of its proper divisors (23033896003).

211202220221 is a wasteful number, since it uses less digits than its factorization.

211202220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2054140.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 211202220221 its reverse (122022202112), we get a palindrome (333224422333).

The spelling of 211202220221 in words is "two hundred eleven billion, two hundred two million, two hundred twenty thousand, two hundred twenty-one".