222021111 has 16 divisors (see below), whose sum is σ = 319522784. Its totient is φ = 136318464.

The previous prime is 222021103. The next prime is 222021113. The reversal of 222021111 is 111120222.

It is not a de Polignac number, because 222021111 - 2³ = 222021103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222021113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11595 + ... + 24051.

It is an arithmetic number, because the mean of its divisors is an integer number (19970174).

Almost surely, 2^222021111 is an apocalyptic number.

222021111 is a deficient number, since it is larger than the sum of its proper divisors (97501673).

222021111 is a wasteful number, since it uses less digits than its factorization.

222021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12930.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 222021111 is about 14900.3728476840. The cubic root of 222021111 is about 605.5240874569.

Adding to 222021111 its reverse (111120222), we get a palindrome (333141333).

It can be divided in two parts, 2220211 and 11, that added together give a palindrome (2220222).

The spelling of 222021111 in words is "two hundred twenty-two million, twenty-one thousand, one hundred eleven".