1220111101011 has 16 divisors (see below), whose sum is σ = 1822672113408. Its totient is φ = 719475832800.

The previous prime is 1220111101009. The next prime is 1220111101019. The reversal of 1220111101011 is 1101011110221.

It is not a de Polignac number, because 1220111101011 - 2¹ = 1220111101009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220111101019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 499634775 + ... + 499637216.

It is an arithmetic number, because the mean of its divisors is an integer number (113917007088).

Almost surely, 2^{1220111101011} is an apocalyptic number.

1220111101011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1220111101011 is a deficient number, since it is larger than the sum of its proper divisors (602561012397).

1220111101011 is a wasteful number, since it uses less digits than its factorization.

1220111101011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999272042.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 1220111101011 its reverse (1101011110221), we get a palindrome (2321122211232).

The spelling of 1220111101011 in words is "one trillion, two hundred twenty billion, one hundred eleven million, one hundred one thousand, eleven".