202211212221 has 6 divisors (see below), whose sum is σ = 292082862110. Its totient is φ = 134807474808.

The previous prime is 202211212207. The next prime is 202211212241. The reversal of 202211212221 is 122212112202.

It is a happy number.

202211212221 is a `hidden beast` number, since 20 + 2 + 211 + 212 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 191397500100 + 10813712121 = 437490^2 + 103989^2 .

It is not a de Polignac number, because 202211212221 - 2³¹ = 200063728573 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202211212194 and 202211212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202211212241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11233956226 + ... + 11233956243.

Almost surely, 2^202211212221 is an apocalyptic number.

It is an amenable number.

202211212221 is a deficient number, since it is larger than the sum of its proper divisors (89871649889).

202211212221 is a wasteful number, since it uses less digits than its factorization.

202211212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22467912475 (or 22467912472 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 202211212221 its reverse (122212112202), we get a palindrome (324423324423).

The spelling of 202211212221 in words is "two hundred two billion, two hundred eleven million, two hundred twelve thousand, two hundred twenty-one".