1221112112011 has 16 divisors (see below), whose sum is σ = 1409618723328. Its totient is φ = 1046881158400.

The previous prime is 1221112111991. The next prime is 1221112112023. The reversal of 1221112112011 is 1102112111221.

It is not a de Polignac number, because 1221112112011 - 2⁵ = 1221112111979 is a prime.

It is a super-2 number, since 2×1221112112011² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221112112041) 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, 33971686 + ... + 34007611.

It is an arithmetic number, because the mean of its divisors is an integer number (88101170208).

Almost surely, 2^{1221112112011} is an apocalyptic number.

1221112112011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1221112112011 is a deficient number, since it is larger than the sum of its proper divisors (188506611317).

1221112112011 is a wasteful number, since it uses less digits than its factorization.

1221112112011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67979402.

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

Adding to 1221112112011 its reverse (1102112111221), we get a palindrome (2323224223232).

The spelling of 1221112112011 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, one hundred twelve thousand, eleven".