1221002120222 has 8 divisors (see below), whose sum is σ = 1832405849400. Its totient is φ = 610200170424.

The previous prime is 1221002120213. The next prime is 1221002120237. The reversal of 1221002120222 is 2220212001221.

It is a happy number.

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 1221002120222.

It is a congruent number.

It is an unprimeable number.

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, 150439772 + ... + 150447887.

It is an arithmetic number, because the mean of its divisors is an integer number (229050731175).

Almost surely, 2^{1221002120222} is an apocalyptic number.

1221002120222 is a deficient number, since it is larger than the sum of its proper divisors (611403729178).

1221002120222 is a wasteful number, since it uses less digits than its factorization.

1221002120222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300889690.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1221002120222 its reverse (2220212001221), we get a palindrome (3441214121443).

The spelling of 1221002120222 in words is "one trillion, two hundred twenty-one billion, two million, one hundred twenty thousand, two hundred twenty-two".