1211443423 has 4 divisors (see below), whose sum is σ = 1217593080. Its totient is φ = 1205293768.

The previous prime is 1211443411. The next prime is 1211443427. The reversal of 1211443423 is 3243441121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3243441121 = 2693 ⋅1204397.

It is a cyclic number.

It is not a de Polignac number, because 1211443423 - 2⁵ = 1211443391 is a prime.

It is a super-3 number, since 3×1211443423³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211443427) 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, 3074533 + ... + 3074926.

It is an arithmetic number, because the mean of its divisors is an integer number (304398270).

Almost surely, 2^1211443423 is an apocalyptic number.

1211443423 is a deficient number, since it is larger than the sum of its proper divisors (6149657).

1211443423 is an equidigital number, since it uses as much as digits as its factorization.

1211443423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6149656.

The product of its digits is 2304, while the sum is 25.

The square root of 1211443423 is about 34805.7958248335. The cubic root of 1211443423 is about 1066.0257914693.

Adding to 1211443423 its reverse (3243441121), we get a palindrome (4454884544).

The spelling of 1211443423 in words is "one billion, two hundred eleven million, four hundred forty-three thousand, four hundred twenty-three".