1220221220122 has 4 divisors (see below), whose sum is σ = 1830331830186. Its totient is φ = 610110610060.

The previous prime is 1220221220087. The next prime is 1220221220129. The reversal of 1220221220122 is 2210221220221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 974265728401 + 245955491721 = 987049^2 + 495939^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1220221220122.

It is not an unprimeable number, because it can be changed into a prime (1220221220129) by changing a digit.

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 as a sum of consecutive naturals, namely, 305055305029 + ... + 305055305032.

Almost surely, 2^{1220221220122} is an apocalyptic number.

1220221220122 is a deficient number, since it is larger than the sum of its proper divisors (610110610064).

1220221220122 is an equidigital number, since it uses as much as digits as its factorization.

1220221220122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610110610063.

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

Adding to 1220221220122 its reverse (2210221220221), we get a palindrome (3430442440343).

Subtracting 1220221220122 from its reverse (2210221220221), we obtain a palindrome (990000000099).

The spelling of 1220221220122 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, two hundred twenty thousand, one hundred twenty-two".