1221022220222 has 8 divisors (see below), whose sum is σ = 2093180948976. Its totient is φ = 523295237232.

The previous prime is 1221022220161. The next prime is 1221022220261. The reversal of 1221022220222 is 2220222201221.

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 = 1221022220194 and 1221022220203.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 43607936423 + ... + 43607936450.

It is an arithmetic number, because the mean of its divisors is an integer number (261647618622).

Almost surely, 2^{1221022220222} is an apocalyptic number.

1221022220222 is a deficient number, since it is larger than the sum of its proper divisors (872158728754).

1221022220222 is an equidigital number, since it uses as much as digits as its factorization.

1221022220222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87215872882.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 1221022220222 its reverse (2220222201221), we get a palindrome (3441244421443).

The spelling of 1221022220222 in words is "one trillion, two hundred twenty-one billion, twenty-two million, two hundred twenty thousand, two hundred twenty-two".