1121220210221 has 4 divisors (see below), whose sum is σ = 1187174340252. Its totient is φ = 1055266080192.

The previous prime is 1121220210217. The next prime is 1121220210241. The reversal of 1121220210221 is 1220120221211.

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

It can be written as a sum of positive squares in 2 ways, for example, as 462665238025 + 658554972196 = 680195^2 + 811514^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121220210221 - 2² = 1121220210217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 65954130013 = 1121220210221 / (1 + 1 + 2 + 1 + 2 + 2 + 0 + 2 + 1 + 0 + 2 + 2 + 1).

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 1121220210221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121220210241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32977064990 + ... + 32977065023.

It is an arithmetic number, because the mean of its divisors is an integer number (296793585063).

Almost surely, 2^{1121220210221} is an apocalyptic number.

It is an amenable number.

1121220210221 is a deficient number, since it is larger than the sum of its proper divisors (65954130031).

1121220210221 is an equidigital number, since it uses as much as digits as its factorization.

1121220210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65954130030.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1121220210221 its reverse (1220120221211), we get a palindrome (2341340431432).

The spelling of 1121220210221 in words is "one trillion, one hundred twenty-one billion, two hundred twenty million, two hundred ten thousand, two hundred twenty-one".