1213223221111 has 24 divisors (see below), whose sum is σ = 1367249424912. Its totient is φ = 1075099132800.

The previous prime is 1213223220983. The next prime is 1213223221141. The reversal of 1213223221111 is 1111223223121.

It is a happy number.

It is not a de Polignac number, because 1213223221111 - 2⁷ = 1213223220983 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 (1213223221141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5664505 + ... + 5874781.

It is an arithmetic number, because the mean of its divisors is an integer number (56968726038).

Almost surely, 2^{1213223221111} is an apocalyptic number.

1213223221111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1213223221111 is a deficient number, since it is larger than the sum of its proper divisors (154026203801).

1213223221111 is a wasteful number, since it uses less digits than its factorization.

1213223221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211503 (or 211492 counting only the distinct ones).

The product of its digits is 288, while the sum is 22.

Adding to 1213223221111 its reverse (1111223223121), we get a palindrome (2324446444232).

It can be divided in two parts, 121322 and 3221111, that added together give a palindrome (3342433).

The spelling of 1213223221111 in words is "one trillion, two hundred thirteen billion, two hundred twenty-three million, two hundred twenty-one thousand, one hundred eleven".