11221212221111 has 2 divisors, whose sum is σ = 11221212221112. Its totient is φ = 11221212221110.

The previous prime is 11221212221053. The next prime is 11221212221189. The reversal of 11221212221111 is 11112221212211.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11221212221111 - 2⁴² = 6823165710007 is a prime.

It is a super-2 number, since 2×11221212221111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11221212221411) 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 as a sum of consecutive naturals, namely, 5610606110555 + 5610606110556.

It is an arithmetic number, because the mean of its divisors is an integer number (5610606110556).

Almost surely, 2^{11221212221111} is an apocalyptic number.

11221212221111 is a deficient number, since it is larger than the sum of its proper divisors (1).

11221212221111 is an equidigital number, since it uses as much as digits as its factorization.

11221212221111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64, while the sum is 20.

Adding to 11221212221111 its reverse (11112221212211), we get a palindrome (22333433433322).

The spelling of 11221212221111 in words is "eleven trillion, two hundred twenty-one billion, two hundred twelve million, two hundred twenty-one thousand, one hundred eleven".