1221012220222 has 8 divisors (see below), whose sum is σ = 1832475742416. Its totient is φ = 610186972752.

The previous prime is 1221012220213. The next prime is 1221012220229. The reversal of 1221012220222 is 2220222101221.

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 1221012220222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221012220229) 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, 159563898 + ... + 159571549.

It is an arithmetic number, because the mean of its divisors is an integer number (229059467802).

Almost surely, 2^{1221012220222} is an apocalyptic number.

1221012220222 is a deficient number, since it is larger than the sum of its proper divisors (611463522194).

1221012220222 is a wasteful number, since it uses less digits than its factorization.

1221012220222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319137362.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 1221012220222 its reverse (2220222101221), we get a palindrome (3441234321443).

The spelling of 1221012220222 in words is "one trillion, two hundred twenty-one billion, twelve million, two hundred twenty thousand, two hundred twenty-two".