202122211221 has 112 divisors (see below), whose sum is σ = 362757921024. Its totient is φ = 110060197632.

The previous prime is 202122211171. The next prime is 202122211243. The reversal of 202122211221 is 122112221202.

It is a happy number.

202122211221 is a `hidden beast` number, since 20 + 212 + 2 + 211 + 221 = 666.

It is not a de Polignac number, because 202122211221 - 2¹⁸ = 202121949077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202122211194 and 202122211203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202122211721) by changing a digit.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 32508105 + ... + 32514321.

Almost surely, 2^202122211221 is an apocalyptic number.

202122211221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

202122211221 is a deficient number, since it is larger than the sum of its proper divisors (160635709803).

202122211221 is an equidigital number, since it uses as much as digits as its factorization.

202122211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6542 (or 6527 counting only the distinct ones).

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

Adding to 202122211221 its reverse (122112221202), we get a palindrome (324234432423).

The spelling of 202122211221 in words is "two hundred two billion, one hundred twenty-two million, two hundred eleven thousand, two hundred twenty-one".