1221221021222 has 8 divisors (see below), whose sum is σ = 1839432493272. Its totient is φ = 608076856800.

The previous prime is 1221221021219. The next prime is 1221221021227. The reversal of 1221221021222 is 2221201221221.

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

It is a junction number, because it is equal to n+sod(n) for n = 1221221021194 and 1221221021203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221221021227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1266826304 + ... + 1266827267.

It is an arithmetic number, because the mean of its divisors is an integer number (229929061659).

Almost surely, 2^{1221221021222} is an apocalyptic number.

1221221021222 is a deficient number, since it is larger than the sum of its proper divisors (618211472050).

1221221021222 is a wasteful number, since it uses less digits than its factorization.

1221221021222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2533653814.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 1221221021222 its reverse (2221201221221), we get a palindrome (3442422242443).

The spelling of 1221221021222 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, twenty-one thousand, two hundred twenty-two".