221212222111 has 8 divisors (see below), whose sum is σ = 230244162480. Its totient is φ = 212273877312.

The previous prime is 221212222103. The next prime is 221212222129. The reversal of 221212222111 is 111222212122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221212222111 - 2³ = 221212222103 is a prime.

It is a super-2 number, since 2×221212222111² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221212222151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23394070 + ... + 23403523.

It is an arithmetic number, because the mean of its divisors is an integer number (28780520310).

Almost surely, 2^221212222111 is an apocalyptic number.

221212222111 is a deficient number, since it is larger than the sum of its proper divisors (9031940369).

221212222111 is a wasteful number, since it uses less digits than its factorization.

221212222111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46797785.

The product of its digits is 128, while the sum is 19.

Adding to 221212222111 its reverse (111222212122), we get a palindrome (332434434233).

The spelling of 221212222111 in words is "two hundred twenty-one billion, two hundred twelve million, two hundred twenty-two thousand, one hundred eleven".