11021222111221 has 12 divisors (see below), whose sum is σ = 13574758567788. Its totient is φ = 8891069937792.

The previous prime is 11021222111209. The next prime is 11021222111257. The reversal of 11021222111221 is 12211122212011.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5935119164100 + 5086102947121 = 2436210^2 + 2255239^2 .

It is not a de Polignac number, because 11021222111221 - 2¹³ = 11021222103029 is a prime.

It is a super-2 number, since 2×11021222111221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11021222111201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6615378586 + ... + 6615380251.

It is an arithmetic number, because the mean of its divisors is an integer number (1131229880649).

Almost surely, 2^{11021222111221} is an apocalyptic number.

It is an amenable number.

11021222111221 is a deficient number, since it is larger than the sum of its proper divisors (2553536456567).

11021222111221 is a wasteful number, since it uses less digits than its factorization.

11021222111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13230758868 (or 13230758861 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 11021222111221 its reverse (12211122212011), we get a palindrome (23232344323232).

The spelling of 11021222111221 in words is "eleven trillion, twenty-one billion, two hundred twenty-two million, one hundred eleven thousand, two hundred twenty-one".