1221301220223 has 8 divisors (see below), whose sum is σ = 1861030430848. Its totient is φ = 697886411544.

The previous prime is 1221301220203. The next prime is 1221301220257. The reversal of 1221301220223 is 3220221031221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221301220223 - 2¹⁶ = 1221301154687 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 58157200963 = 1221301220223 / (1 + 2 + 2 + 1 + 3 + 0 + 1 + 2 + 2 + 0 + 2 + 2 + 3).

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 1221301220223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221301220203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29078600461 + ... + 29078600502.

It is an arithmetic number, because the mean of its divisors is an integer number (232628803856).

Almost surely, 2^{1221301220223} is an apocalyptic number.

1221301220223 is a deficient number, since it is larger than the sum of its proper divisors (639729210625).

1221301220223 is an equidigital number, since it uses as much as digits as its factorization.

1221301220223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58157200973.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 1221301220223 its reverse (3220221031221), we get a palindrome (4441522251444).

The spelling of 1221301220223 in words is "one trillion, two hundred twenty-one billion, three hundred one million, two hundred twenty thousand, two hundred twenty-three".