1211221121222 has 32 divisors (see below), whose sum is σ = 2080148318208. Its totient is φ = 518152746816.

The previous prime is 1211221121189. The next prime is 1211221121281. The reversal of 1211221121222 is 2221211221121.

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

It is a junction number, because it is equal to n+sod(n) for n = 1211221121194 and 1211221121203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99055073 + ... + 99067299.

It is an arithmetic number, because the mean of its divisors is an integer number (65004634944).

Almost surely, 2^{1211221121222} is an apocalyptic number.

1211221121222 is a deficient number, since it is larger than the sum of its proper divisors (868927196986).

1211221121222 is a wasteful number, since it uses less digits than its factorization.

1211221121222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24500.

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

Adding to 1211221121222 its reverse (2221211221121), we get a palindrome (3432432342343).

The spelling of 1211221121222 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty-two".