1220122111111 has 4 divisors (see below), whose sum is σ = 1220158843072. Its totient is φ = 1220085379152.

The previous prime is 1220122111069. The next prime is 1220122111129. The reversal of 1220122111111 is 1111112210221.

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 1220122111111 - 2⁷ = 1220122110983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220122111171) 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, 18316110 + ... + 18382603.

It is an arithmetic number, because the mean of its divisors is an integer number (305039710768).

Almost surely, 2^{1220122111111} is an apocalyptic number.

1220122111111 is a deficient number, since it is larger than the sum of its proper divisors (36731961).

1220122111111 is an equidigital number, since it uses as much as digits as its factorization.

1220122111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36731960.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 1220122111111 its reverse (1111112210221), we get a palindrome (2331234321332).

The spelling of 1220122111111 in words is "one trillion, two hundred twenty billion, one hundred twenty-two million, one hundred eleven thousand, one hundred eleven".