11112212221 has 4 divisors (see below), whose sum is σ = 12122413344. Its totient is φ = 10102011100.

The previous prime is 11112212173. The next prime is 11112212269. The reversal of 11112212221 is 12221221111.

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 an interprime number because it is at equal distance from previous prime (11112212173) and next prime (11112212269).

It is a cyclic number.

It is not a de Polignac number, because 11112212221 - 2⁷ = 11112212093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11112212195 and 11112212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11112212281) 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, 505100545 + ... + 505100566.

It is an arithmetic number, because the mean of its divisors is an integer number (3030603336).

Almost surely, 2^11112212221 is an apocalyptic number.

11112212221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11112212221 is a deficient number, since it is larger than the sum of its proper divisors (1010201123).

11112212221 is a wasteful number, since it uses less digits than its factorization.

11112212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010201122.

The product of its digits is 32, while the sum is 16.

Adding to 11112212221 its reverse (12221221111), we get a palindrome (23333433332).

The spelling of 11112212221 in words is "eleven billion, one hundred twelve million, two hundred twelve thousand, two hundred twenty-one".