202121121222 has 48 divisors (see below), whose sum is σ = 450514270752. Its totient is φ = 65443593600.

The previous prime is 202121121199. The next prime is 202121121227. The reversal of 202121121222 is 222121121202.

It is a happy number.

202121121222 is a `hidden beast` number, since 202 + 121 + 121 + 222 = 666.

202121121222 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 = 202121121195 and 202121121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202121121227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 147783 + ... + 652749.

It is an arithmetic number, because the mean of its divisors is an integer number (9385713974).

Almost surely, 2^202121121222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 202121121222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (225257135376).

202121121222 is an abundant number, since it is smaller than the sum of its proper divisors (248393149530).

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

202121121222 is a wasteful number, since it uses less digits than its factorization.

202121121222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505613 (or 505610 counting only the distinct ones).

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

Adding to 202121121222 its reverse (222121121202), we get a palindrome (424242242424).

The spelling of 202121121222 in words is "two hundred two billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty-two".