1213311123133 has 4 divisors (see below), whose sum is σ = 1213351823068. Its totient is φ = 1213270423200.

The previous prime is 1213311123109. The next prime is 1213311123169. The reversal of 1213311123133 is 3313211133121.

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 310607811684 + 902703311449 = 557322^2 + 950107^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213311123133 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213311123098 and 1213311123107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213311163133) 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, 20305218 + ... + 20364883.

It is an arithmetic number, because the mean of its divisors is an integer number (303337955767).

Almost surely, 2^{1213311123133} is an apocalyptic number.

It is an amenable number.

1213311123133 is a deficient number, since it is larger than the sum of its proper divisors (40699935).

1213311123133 is an equidigital number, since it uses as much as digits as its factorization.

1213311123133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40699934.

The product of its digits is 972, while the sum is 25.

Adding to 1213311123133 its reverse (3313211133121), we get a palindrome (4526522256254).

The spelling of 1213311123133 in words is "one trillion, two hundred thirteen billion, three hundred eleven million, one hundred twenty-three thousand, one hundred thirty-three".