201221022222220 has 192 divisors, whose sum is σ = 567397132388352. Its totient is φ = 57889854720000.

The previous prime is 201221022222217. The next prime is 201221022222281. The reversal of 201221022222220 is 22222220122102.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 201221022222191 and 201221022222200.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 303191745 + ... + 303854695.

It is an arithmetic number, because the mean of its divisors is an integer number (2955193397856).

Almost surely, 2^{201221022222220} is an apocalyptic number.

201221022222220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201221022222220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283698566194176).

201221022222220 is an abundant number, since it is smaller than the sum of its proper divisors (366176110166132).

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

201221022222220 is a wasteful number, since it uses less digits than its factorization.

201221022222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678152 (or 678150 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 201221022222220 its reverse (22222220122102), we get a palindrome (223443242344322).

It can be divided in two parts, 20122102 and 2222220, that added together give a palindrome (22344322).

The spelling of 201221022222220 in words is "two hundred one trillion, two hundred twenty-one billion, twenty-two million, two hundred twenty-two thousand, two hundred twenty".