22221221111 has 2 divisors, whose sum is σ = 22221221112. Its totient is φ = 22221221110.

The previous prime is 22221221083. The next prime is 22221221137. The reversal of 22221221111 is 11112212222.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22221221111 - 2²² = 22217026807 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22221221111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22221241111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11110610555 + 11110610556.

It is an arithmetic number, because the mean of its divisors is an integer number (11110610556).

Almost surely, 2^22221221111 is an apocalyptic number.

22221221111 is a deficient number, since it is larger than the sum of its proper divisors (1).

22221221111 is an equidigital number, since it uses as much as digits as its factorization.

22221221111 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 22221221111 its reverse (11112212222), we get a palindrome (33333433333).

It can be divided in two parts, 222212211 and 11, that added together give a palindrome (222212222).

The spelling of 22221221111 in words is "twenty-two billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred eleven".