1223322221 has 12 divisors (see below), whose sum is σ = 1345734432. Its totient is φ = 1111209000.

The previous prime is 1223322209. The next prime is 1223322223. The reversal of 1223322221 is 1222233221.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1223322221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1223322193 and 1223322202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223322223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 179486 + ... + 186176.

It is an arithmetic number, because the mean of its divisors is an integer number (112144536).

Almost surely, 2^1223322221 is an apocalyptic number.

1223322221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1223322221 is a deficient number, since it is larger than the sum of its proper divisors (122412211).

1223322221 is a wasteful number, since it uses less digits than its factorization.

1223322221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8224 (or 8213 counting only the distinct ones).

The product of its digits is 576, while the sum is 20.

The square root of 1223322221 is about 34976.0235161174. The cubic root of 1223322221 is about 1069.4987668975.

Adding to 1223322221 its reverse (1222233221), we get a palindrome (2445555442).

The spelling of 1223322221 in words is "one billion, two hundred twenty-three million, three hundred twenty-two thousand, two hundred twenty-one".