201021221222221 has 16 divisors (see below), whose sum is σ = 205922616457536. Its totient is φ = 196130237861376.

The previous prime is 201021221222219. The next prime is 201021221222243. The reversal of 201021221222221 is 122222122120102.

It is a cyclic number.

It is not a de Polignac number, because 201021221222221 - 2¹ = 201021221222219 is a prime.

It is a super-2 number, since 2×201021221222221² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 201021221222192 and 201021221222201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021221222251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143779101 + ... + 145170493.

It is an arithmetic number, because the mean of its divisors is an integer number (12870163528596).

Almost surely, 2^{201021221222221} is an apocalyptic number.

It is an amenable number.

201021221222221 is a deficient number, since it is larger than the sum of its proper divisors (4901395235315).

201021221222221 is a wasteful number, since it uses less digits than its factorization.

201021221222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395132.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 201021221222221 its reverse (122222122120102), we get a palindrome (323243343342323).

The spelling of 201021221222221 in words is "two hundred one trillion, twenty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty-one".