1211111001222 has 32 divisors (see below), whose sum is σ = 2510892345600. Its totient is φ = 388982448288.

The previous prime is 1211111001179. The next prime is 1211111001229. The reversal of 1211111001222 is 2221001111121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211111001229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7061472 + ... + 7230947.

It is an arithmetic number, because the mean of its divisors is an integer number (78465385800).

Almost surely, 2^{1211111001222} is an apocalyptic number.

1211111001222 is an abundant number, since it is smaller than the sum of its proper divisors (1299781344378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211111001222 is a wasteful number, since it uses less digits than its factorization.

1211111001222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14292940.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1211111001222 its reverse (2221001111121), we get a palindrome (3432112112343).

The spelling of 1211111001222 in words is "one trillion, two hundred eleven billion, one hundred eleven million, one thousand, two hundred twenty-two".