1111212021011 has 4 divisors (see below), whose sum is σ = 1111278613224. Its totient is φ = 1111145428800.

The previous prime is 1111212021001. The next prime is 1111212021041. The reversal of 1111212021011 is 1101202121111.

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 1111212021011 - 2³⁴ = 1094032151827 is a prime.

It is a super-2 number, since 2×1111212021011² (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 (1111212021001) 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 3 ways as a sum of consecutive naturals, for example, 33271070 + ... + 33304451.

It is an arithmetic number, because the mean of its divisors is an integer number (277819653306).

Almost surely, 2^{1111212021011} is an apocalyptic number.

1111212021011 is a deficient number, since it is larger than the sum of its proper divisors (66592213).

1111212021011 is an equidigital number, since it uses as much as digits as its factorization.

1111212021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66592212.

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

Adding to 1111212021011 its reverse (1101202121111), we get a palindrome (2212414142122).

The spelling of 1111212021011 in words is "one trillion, one hundred eleven billion, two hundred twelve million, twenty-one thousand, eleven".