1111221222212 has 6 divisors (see below), whose sum is σ = 1944637138878. Its totient is φ = 555610611104.

The previous prime is 1111221222203. The next prime is 1111221222217. The reversal of 1111221222212 is 2122221221111.

It can be written as a sum of positive squares in only one way, i.e., 903781054276 + 207440167936 = 950674^2 + 455456^2 .

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1111221222217) 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 as a sum of consecutive naturals, namely, 138902652773 + ... + 138902652780.

It is an arithmetic number, because the mean of its divisors is an integer number (324106189813).

Almost surely, 2^{1111221222212} is an apocalyptic number.

It is an amenable number.

1111221222212 is a deficient number, since it is larger than the sum of its proper divisors (833415916666).

1111221222212 is a wasteful number, since it uses less digits than its factorization.

1111221222212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277805305557 (or 277805305555 counting only the distinct ones).

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

Adding to 1111221222212 its reverse (2122221221111), we get a palindrome (3233442443323).

The spelling of 1111221222212 in words is "one trillion, one hundred eleven billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred twelve".