1220123210111 has 4 divisors (see below), whose sum is σ = 1313978841672. Its totient is φ = 1126267578552.

The previous prime is 1220123210107. The next prime is 1220123210143. The reversal of 1220123210111 is 1110123210221.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1220123210111 - 2² = 1220123210107 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 1220123210111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220123212111) 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 in 3 ways as a sum of consecutive naturals, for example, 46927815761 + ... + 46927815786.

It is an arithmetic number, because the mean of its divisors is an integer number (328494710418).

Almost surely, 2^{1220123210111} is an apocalyptic number.

1220123210111 is a deficient number, since it is larger than the sum of its proper divisors (93855631561).

1220123210111 is an equidigital number, since it uses as much as digits as its factorization.

1220123210111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93855631560.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1220123210111 its reverse (1110123210221), we get a palindrome (2330246420332).

The spelling of 1220123210111 in words is "one trillion, two hundred twenty billion, one hundred twenty-three million, two hundred ten thousand, one hundred eleven".