1220121111011 has 32 divisors (see below), whose sum is σ = 1438710681600. Its totient is φ = 1023031658880.

The previous prime is 1220121110983. The next prime is 1220121111019. The reversal of 1220121111011 is 1101111210221.

It is not a de Polignac number, because 1220121111011 - 2⁶ = 1220121110947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220121111019) 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 31 ways as a sum of consecutive naturals, for example, 5444270 + ... + 5663948.

It is an arithmetic number, because the mean of its divisors is an integer number (44959708800).

Almost surely, 2^{1220121111011} is an apocalyptic number.

1220121111011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1220121111011 is a deficient number, since it is larger than the sum of its proper divisors (218589570589).

1220121111011 is a wasteful number, since it uses less digits than its factorization.

1220121111011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220499.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1220121111011 its reverse (1101111210221), we get a palindrome (2321232321232).

The spelling of 1220121111011 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, one hundred eleven thousand, eleven".