1221122223 has 20 divisors (see below), whose sum is σ = 1931450400. Its totient is φ = 766193472.

The previous prime is 1221122207. The next prime is 1221122239. The reversal of 1221122223 is 3222211221.

It is an interprime number because it is at equal distance from previous prime (1221122207) and next prime (1221122239).

It is not a de Polignac number, because 1221122223 - 2⁴ = 1221122207 is a prime.

It is a super-2 number, since 2×1221122223² = 2982278967008923458, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221122196 and 1221122205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221127223) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 442023 + ... + 444776.

It is an arithmetic number, because the mean of its divisors is an integer number (96572520).

Almost surely, 2^1221122223 is an apocalyptic number.

1221122223 is a deficient number, since it is larger than the sum of its proper divisors (710328177).

1221122223 is an equidigital number, since it uses as much as digits as its factorization.

1221122223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886828 (or 886819 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 1221122223 is about 34944.5592760876. The cubic root of 1221122223 is about 1068.8572605184.

Adding to 1221122223 its reverse (3222211221), we get a palindrome (4443333444).

The spelling of 1221122223 in words is "one billion, two hundred twenty-one million, one hundred twenty-two thousand, two hundred twenty-three".