1221011202223 has 4 divisors (see below), whose sum is σ = 1221019826800. Its totient is φ = 1221002577648.

The previous prime is 1221011202221. The next prime is 1221011202227. The reversal of 1221011202223 is 3222021101221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221011202223 - 2¹ = 1221011202221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221011202223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221011202221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4096323 + ... + 4384276.

It is an arithmetic number, because the mean of its divisors is an integer number (305254956700).

Almost surely, 2^{1221011202223} is an apocalyptic number.

1221011202223 is a deficient number, since it is larger than the sum of its proper divisors (8624577).

1221011202223 is an equidigital number, since it uses as much as digits as its factorization.

1221011202223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8624576.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 1221011202223 its reverse (3222021101221), we get a palindrome (4443032303444).

The spelling of 1221011202223 in words is "one trillion, two hundred twenty-one billion, eleven million, two hundred two thousand, two hundred twenty-three".