22122221111 has 2 divisors, whose sum is σ = 22122221112. Its totient is φ = 22122221110.

The previous prime is 22122221087. The next prime is 22122221141. The reversal of 22122221111 is 11112222122.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22122221111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22122221111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22122221141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11061110555 + 11061110556.

It is an arithmetic number, because the mean of its divisors is an integer number (11061110556).

Almost surely, 2^22122221111 is an apocalyptic number.

22122221111 is a deficient number, since it is larger than the sum of its proper divisors (1).

22122221111 is an equidigital number, since it uses as much as digits as its factorization.

22122221111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64, while the sum is 17.

Adding to 22122221111 its reverse (11112222122), we get a palindrome (33234443233).

The spelling of 22122221111 in words is "twenty-two billion, one hundred twenty-two million, two hundred twenty-one thousand, one hundred eleven".