20122222111221 has 16 divisors (see below), whose sum is σ = 28064585358720. Its totient is φ = 12800188896000.

The previous prime is 20122222111177. The next prime is 20122222111259. The reversal of 20122222111221 is 12211122222102.

It is not a de Polignac number, because 20122222111221 - 2¹³ = 20122222103029 is a prime.

It is a super-2 number, since 2×20122222111221² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122222111291) 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 15 ways as a sum of consecutive naturals, for example, 356483280 + ... + 356539721.

It is an arithmetic number, because the mean of its divisors is an integer number (1754036584920).

Almost surely, 2^{20122222111221} is an apocalyptic number.

It is an amenable number.

20122222111221 is a deficient number, since it is larger than the sum of its proper divisors (7942363247499).

20122222111221 is a wasteful number, since it uses less digits than its factorization.

20122222111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713023436.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 20122222111221 its reverse (12211122222102), we get a palindrome (32333344333323).

The spelling of 20122222111221 in words is "twenty trillion, one hundred twenty-two billion, two hundred twenty-two million, one hundred eleven thousand, two hundred twenty-one".