1223212111 has 18 divisors (see below), whose sum is σ = 1359336608. Its totient is φ = 1099890000.

The previous prime is 1223212091. The next prime is 1223212127. The reversal of 1223212111 is 1112123221.

It is not a de Polignac number, because 1223212111 - 2⁵ = 1223212079 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 (1223212181) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1233826 + ... + 1234816.

Almost surely, 2^1223212111 is an apocalyptic number.

1223212111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1223212111 is a deficient number, since it is larger than the sum of its proper divisors (136124497).

1223212111 is an equidigital number, since it uses as much as digits as its factorization.

1223212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1215 (or 1103 counting only the distinct ones).

The product of its digits is 48, while the sum is 16.

The square root of 1223212111 is about 34974.4494023852. The cubic root of 1223212111 is about 1069.4666777660.

Adding to 1223212111 its reverse (1112123221), we get a palindrome (2335335332).

The spelling of 1223212111 in words is "one billion, two hundred twenty-three million, two hundred twelve thousand, one hundred eleven".