22112012111221 has 4 divisors (see below), whose sum is σ = 22874495287500. Its totient is φ = 21349528934944.

The previous prime is 22112012111219. The next prime is 22112012111249. The reversal of 22112012111221 is 12211121021122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15706121979025 + 6405890132196 = 3963095^2 + 2530986^2 .

It is a cyclic number.

It is not a de Polignac number, because 22112012111221 - 2¹ = 22112012111219 is a prime.

It is a super-2 number, since 2×22112012111221² (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 (22112012111251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 381241588096 + ... + 381241588153.

It is an arithmetic number, because the mean of its divisors is an integer number (5718623821875).

Almost surely, 2^{22112012111221} is an apocalyptic number.

It is an amenable number.

22112012111221 is a deficient number, since it is larger than the sum of its proper divisors (762483176279).

22112012111221 is an equidigital number, since it uses as much as digits as its factorization.

22112012111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762483176278.

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

Adding to 22112012111221 its reverse (12211121021122), we get a palindrome (34323133132343).

The spelling of 22112012111221 in words is "twenty-two trillion, one hundred twelve billion, twelve million, one hundred eleven thousand, two hundred twenty-one".