22012122111221 has 16 divisors (see below), whose sum is σ = 24590967275520. Its totient is φ = 19531887733680.

The previous prime is 22012122111197. The next prime is 22012122111247. The reversal of 22012122111221 is 12211122121022.

It is a de Polignac number, because none of the positive numbers 2^k-22012122111221 is a prime.

It is a super-2 number, since 2×22012122111221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22012122111193 and 22012122111202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22012122110221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57816581 + ... + 58196058.

It is an arithmetic number, because the mean of its divisors is an integer number (1536935454720).

Almost surely, 2^{22012122111221} is an apocalyptic number.

It is an amenable number.

22012122111221 is a deficient number, since it is larger than the sum of its proper divisors (2578845164299).

22012122111221 is a wasteful number, since it uses less digits than its factorization.

22012122111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116013064.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 22012122111221 its reverse (12211122121022), we get a palindrome (34223244232243).

The spelling of 22012122111221 in words is "twenty-two trillion, twelve billion, one hundred twenty-two million, one hundred eleven thousand, two hundred twenty-one".