202121211222 has 96 divisors (see below), whose sum is σ = 523496636640. Its totient is φ = 57637681920.

The previous prime is 202121211217. The next prime is 202121211223. The reversal of 202121211222 is 222112121202.

It is a happy number.

202121211222 is a `hidden beast` number, since 20 + 212 + 1 + 211 + 222 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 202121211195 and 202121211204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202121211223) 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 47 ways as a sum of consecutive naturals, for example, 1305258 + ... + 1451874.

It is an arithmetic number, because the mean of its divisors is an integer number (5453089965).

Almost surely, 2^202121211222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 202121211222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261748318320).

202121211222 is an abundant number, since it is smaller than the sum of its proper divisors (321375425418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

202121211222 is a wasteful number, since it uses less digits than its factorization.

202121211222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147163 (or 147150 counting only the distinct ones).

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

Adding to 202121211222 its reverse (222112121202), we get a palindrome (424233332424).

The spelling of 202121211222 in words is "two hundred two billion, one hundred twenty-one million, two hundred eleven thousand, two hundred twenty-two".