1221121112011 has 8 divisors (see below), whose sum is σ = 1223218112000. Its totient is φ = 1219025602152.

The previous prime is 1221121111997. The next prime is 1221121112041. The reversal of 1221121112011 is 1102111211221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221121112011 - 2²⁹ = 1220584241099 is a prime.

It is a super-2 number, since 2×1221121112011² (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 (1221121112041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1274056 + ... + 2016298.

It is an arithmetic number, because the mean of its divisors is an integer number (152902264000).

Almost surely, 2^{1221121112011} is an apocalyptic number.

1221121112011 is a deficient number, since it is larger than the sum of its proper divisors (2096999989).

1221121112011 is an equidigital number, since it uses as much as digits as its factorization.

1221121112011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745065.

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

Adding to 1221121112011 its reverse (1102111211221), we get a palindrome (2323232323232).

The spelling of 1221121112011 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred twelve thousand, eleven".