1221210211222 has 8 divisors (see below), whose sum is σ = 1836726350976. Its totient is φ = 608968094232.

The previous prime is 1221210211213. The next prime is 1221210211229. The reversal of 1221210211222 is 2221120121221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1221210211222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221210211229) 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 in 3 ways as a sum of consecutive naturals, for example, 818504758 + ... + 818506249.

It is an arithmetic number, because the mean of its divisors is an integer number (229590793872).

Almost surely, 2^{1221210211222} is an apocalyptic number.

1221210211222 is a deficient number, since it is larger than the sum of its proper divisors (615516139754).

1221210211222 is a wasteful number, since it uses less digits than its factorization.

1221210211222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1637011382.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1221210211222 its reverse (2221120121221), we get a palindrome (3442330332443).

Subtracting 1221210211222 from its reverse (2221120121221), we obtain a palindrome (999909909999).

The spelling of 1221210211222 in words is "one trillion, two hundred twenty-one billion, two hundred ten million, two hundred eleven thousand, two hundred twenty-two".