1220122220111 has 4 divisors (see below), whose sum is σ = 1240802257800. Its totient is φ = 1199442182424.

The previous prime is 1220122220101. The next prime is 1220122220129. The reversal of 1220122220111 is 1110222210221.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220122220111 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220122220111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220122220101) 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, 10340018756 + ... + 10340018873.

It is an arithmetic number, because the mean of its divisors is an integer number (310200564450).

Almost surely, 2^{1220122220111} is an apocalyptic number.

1220122220111 is a deficient number, since it is larger than the sum of its proper divisors (20680037689).

1220122220111 is an equidigital number, since it uses as much as digits as its factorization.

1220122220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20680037688.

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

Adding to 1220122220111 its reverse (1110222210221), we get a palindrome (2330344430332).

The spelling of 1220122220111 in words is "one trillion, two hundred twenty billion, one hundred twenty-two million, two hundred twenty thousand, one hundred eleven".