1211342223 has 32 divisors (see below), whose sum is σ = 2041586176. Its totient is φ = 621675648.

The previous prime is 1211342221. The next prime is 1211342227. The reversal of 1211342223 is 3222431121.

It is not a de Polignac number, because 1211342223 - 2¹ = 1211342221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 1211342223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211342221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49861 + ... + 70062.

It is an arithmetic number, because the mean of its divisors is an integer number (63799568).

Almost surely, 2^1211342223 is an apocalyptic number.

1211342223 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1211342223 is a deficient number, since it is larger than the sum of its proper divisors (830243953).

1211342223 is a wasteful number, since it uses less digits than its factorization.

1211342223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119983.

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

The square root of 1211342223 is about 34804.3420136051. The cubic root of 1211342223 is about 1065.9961065463.

Adding to 1211342223 its reverse (3222431121), we get a palindrome (4433773344).

The spelling of 1211342223 in words is "one billion, two hundred eleven million, three hundred forty-two thousand, two hundred twenty-three".