1221243223 has 2 divisors, whose sum is σ = 1221243224. Its totient is φ = 1221243222.

The previous prime is 1221243211. The next prime is 1221243269. The reversal of 1221243223 is 3223421221.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221243223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221243194 and 1221243203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221243623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610621611 + 610621612.

It is an arithmetic number, because the mean of its divisors is an integer number (610621612).

Almost surely, 2^1221243223 is an apocalyptic number.

1221243223 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221243223 is an equidigital number, since it uses as much as digits as its factorization.

1221243223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 22.

The square root of 1221243223 is about 34946.2905470667. The cubic root of 1221243223 is about 1068.8925634156.

Adding to 1221243223 its reverse (3223421221), we get a palindrome (4444664444).

The spelling of 1221243223 in words is "one billion, two hundred twenty-one million, two hundred forty-three thousand, two hundred twenty-three".