11111221201222 has 16 divisors (see below), whose sum is σ = 17207913600000. Its totient is φ = 5375321710920.

The previous prime is 11111221201219. The next prime is 11111221201229. The reversal of 11111221201222 is 22210212211111.

It is a happy number.

It is a super-2 number, since 2×11111221201222² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11111221201222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111221201229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17614972 + ... + 18234847.

It is an arithmetic number, because the mean of its divisors is an integer number (1075494600000).

Almost surely, 2^{11111221201222} is an apocalyptic number.

11111221201222 is a deficient number, since it is larger than the sum of its proper divisors (6096692398778).

11111221201222 is a wasteful number, since it uses less digits than its factorization.

11111221201222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35854851.

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

Adding to 11111221201222 its reverse (22210212211111), we get a palindrome (33321433412333).

The spelling of 11111221201222 in words is "eleven trillion, one hundred eleven billion, two hundred twenty-one million, two hundred one thousand, two hundred twenty-two".