201221000022222 has 96 divisors (see below), whose sum is σ = 471898418659200. Its totient is φ = 61751319827904.

The previous prime is 201221000022199. The next prime is 201221000022247. The reversal of 201221000022222 is 222220000122102.

201221000022222 is a `hidden beast` number, since 201 + 221 + 0 + 0 + 0 + 0 + 22 + 222 = 666.

It is a super-2 number, since 2×201221000022222² (a number of 29 digits) contains 22 as substring.

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 = 201221000022195 and 201221000022204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 850729 + ... + 20078987.

It is an arithmetic number, because the mean of its divisors is an integer number (4915608527700).

Almost surely, 2^{201221000022222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201221000022222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235949209329600).

201221000022222 is an abundant number, since it is smaller than the sum of its proper divisors (270677418636978).

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

201221000022222 is a wasteful number, since it uses less digits than its factorization.

201221000022222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19229150 (or 19229147 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 201221000022222 its reverse (222220000122102), we get a palindrome (423441000144324).

The spelling of 201221000022222 in words is "two hundred one trillion, two hundred twenty-one billion, twenty-two thousand, two hundred twenty-two".