1211223211043 has 16 divisors (see below), whose sum is σ = 1340352354816. Its totient is φ = 1088682376320.

The previous prime is 1211223211039. The next prime is 1211223211103. The reversal of 1211223211043 is 3401123221121.

It is a cyclic number.

It is not a de Polignac number, because 1211223211043 - 2² = 1211223211039 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211223211243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2207921 + ... + 2701362.

It is an arithmetic number, because the mean of its divisors is an integer number (83772022176).

Almost surely, 2^{1211223211043} is an apocalyptic number.

1211223211043 is a deficient number, since it is larger than the sum of its proper divisors (129129143773).

1211223211043 is a wasteful number, since it uses less digits than its factorization.

1211223211043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4909954.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 1211223211043 its reverse (3401123221121), we get a palindrome (4612346432164).

The spelling of 1211223211043 in words is "one trillion, two hundred eleven billion, two hundred twenty-three million, two hundred eleven thousand, forty-three".