1221021223 has 2 divisors, whose sum is σ = 1221021224. Its totient is φ = 1221021222.

The previous prime is 1221021203. The next prime is 1221021227. The reversal of 1221021223 is 3221201221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221021223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221021197 and 1221021206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221021227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610510611 + 610510612.

It is an arithmetic number, because the mean of its divisors is an integer number (610510612).

Almost surely, 2^1221021223 is an apocalyptic number.

1221021223 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221021223 is an equidigital number, since it uses as much as digits as its factorization.

1221021223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1221021223 is about 34943.1140999196. The cubic root of 1221021223 is about 1068.8277910250.

Adding to 1221021223 its reverse (3221201221), we get a palindrome (4442222444).

It can be divided in two parts, 12210 and 21223, that added together give a palindrome (33433).

The spelling of 1221021223 in words is "one billion, two hundred twenty-one million, twenty-one thousand, two hundred twenty-three".