1211320223 has 4 divisors (see below), whose sum is σ = 1218322248. Its totient is φ = 1204318200.

The previous prime is 1211320217. The next prime is 1211320241. The reversal of 1211320223 is 3220231121.

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 1211320223 - 2⁴ = 1211320207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211320283) 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, 3500753 + ... + 3501098.

It is an arithmetic number, because the mean of its divisors is an integer number (304580562).

Almost surely, 2^1211320223 is an apocalyptic number.

1211320223 is a deficient number, since it is larger than the sum of its proper divisors (7002025).

1211320223 is an equidigital number, since it uses as much as digits as its factorization.

1211320223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7002024.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1211320223 is about 34804.0259596501. The cubic root of 1211320223 is about 1065.9896530834.

Adding to 1211320223 its reverse (3220231121), we get a palindrome (4431551344).

The spelling of 1211320223 in words is "one billion, two hundred eleven million, three hundred twenty thousand, two hundred twenty-three".