1221001002223 has 2 divisors, whose sum is σ = 1221001002224. Its totient is φ = 1221001002222.

The previous prime is 1221001002211. The next prime is 1221001002257. The reversal of 1221001002223 is 3222001001221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221001002223 - 2⁹ = 1221001001711 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221001002197 and 1221001002206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221001002203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610500501111 + 610500501112.

It is an arithmetic number, because the mean of its divisors is an integer number (610500501112).

Almost surely, 2^{1221001002223} is an apocalyptic number.

1221001002223 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221001002223 is an equidigital number, since it uses as much as digits as its factorization.

1221001002223 is an evil number, because the sum of its binary digits is even.

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

Adding to 1221001002223 its reverse (3222001001221), we get a palindrome (4443002003444).

The spelling of 1221001002223 in words is "one trillion, two hundred twenty-one billion, one million, two thousand, two hundred twenty-three".