11012111111221 has 4 divisors (see below), whose sum is σ = 12013212121344. Its totient is φ = 10011010101100.

The previous prime is 11012111111189. The next prime is 11012111111233. The reversal of 11012111111221 is 12211111121011.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11012111111221 - 2⁵ = 11012111111189 is a prime.

It is a super-2 number, since 2×11012111111221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11012111111195 and 11012111111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11012111111291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500550505045 + ... + 500550505066.

It is an arithmetic number, because the mean of its divisors is an integer number (3003303030336).

Almost surely, 2^{11012111111221} is an apocalyptic number.

11012111111221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11012111111221 is a deficient number, since it is larger than the sum of its proper divisors (1001101010123).

11012111111221 is a wasteful number, since it uses less digits than its factorization.

11012111111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001101010122.

The product of its (nonzero) digits is 8, while the sum is 16.

Adding to 11012111111221 its reverse (12211111121011), we get a palindrome (23223222232232).

The spelling of 11012111111221 in words is "eleven trillion, twelve billion, one hundred eleven million, one hundred eleven thousand, two hundred twenty-one".