1221002220122 has 4 divisors (see below), whose sum is σ = 1831503330186. Its totient is φ = 610501110060.

The previous prime is 1221002220107. The next prime is 1221002220133. The reversal of 1221002220122 is 2210222001221.

It is a happy number.

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., 724441001881 + 496561218241 = 851141^2 + 704671^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1221002220122.

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 as a sum of consecutive naturals, namely, 305250555029 + ... + 305250555032.

Almost surely, 2^{1221002220122} is an apocalyptic number.

1221002220122 is a deficient number, since it is larger than the sum of its proper divisors (610501110064).

1221002220122 is an equidigital number, since it uses as much as digits as its factorization.

1221002220122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610501110063.

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

Adding to 1221002220122 its reverse (2210222001221), we get a palindrome (3431224221343).

The spelling of 1221002220122 in words is "one trillion, two hundred twenty-one billion, two million, two hundred twenty thousand, one hundred twenty-two".