1221220110122 has 16 divisors (see below), whose sum is σ = 2041668296640. Its totient is φ = 544444878528.

The previous prime is 1221220110083. The next prime is 1221220110169. The reversal of 1221220110122 is 2210110221221.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 1221220110122.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 945216158 + ... + 945217449.

It is an arithmetic number, because the mean of its divisors is an integer number (127604268540).

Almost surely, 2^{1221220110122} is an apocalyptic number.

1221220110122 is a deficient number, since it is larger than the sum of its proper divisors (820448186518).

1221220110122 is a wasteful number, since it uses less digits than its factorization.

1221220110122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1890433645.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1221220110122 its reverse (2210110221221), we get a palindrome (3431330331343).

The spelling of 1221220110122 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, one hundred ten thousand, one hundred twenty-two".