1221201311222 has 16 divisors (see below), whose sum is σ = 1866904708032. Its totient is φ = 598906414080.

The previous prime is 1221201311207. The next prime is 1221201311227. The reversal of 1221201311222 is 2221131021221.

It is a junction number, because it is equal to n+sod(n) for n = 1221201311194 and 1221201311203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221201311227) 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, 1299854 + ... + 2032737.

It is an arithmetic number, because the mean of its divisors is an integer number (116681544252).

Almost surely, 2^{1221201311222} is an apocalyptic number.

1221201311222 is a deficient number, since it is larger than the sum of its proper divisors (645703396810).

1221201311222 is a wasteful number, since it uses less digits than its factorization.

1221201311222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3336103.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 1221201311222 its reverse (2221131021221), we get a palindrome (3442332332443).

The spelling of 1221201311222 in words is "one trillion, two hundred twenty-one billion, two hundred one million, three hundred eleven thousand, two hundred twenty-two".