1213123233213 has 32 divisors (see below), whose sum is σ = 1964323537920. Its totient is φ = 736621309440.

The previous prime is 1213123233173. The next prime is 1213123233229. The reversal of 1213123233213 is 3123323213121.

1213123233213 is a `hidden beast` number, since 1 + 2 + 1 + 3 + 12 + 323 + 321 + 3 = 666.

It is not a de Polignac number, because 1213123233213 - 2⁸ = 1213123232957 is a prime.

It is a super-2 number, since 2×1213123233213² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213123233233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42614320 + ... + 42642777.

It is an arithmetic number, because the mean of its divisors is an integer number (61385110560).

Almost surely, 2^{1213123233213} is an apocalyptic number.

It is an amenable number.

1213123233213 is a deficient number, since it is larger than the sum of its proper divisors (751200304707).

1213123233213 is a wasteful number, since it uses less digits than its factorization.

1213123233213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85257154 (or 85257148 counting only the distinct ones).

The product of its digits is 3888, while the sum is 27.

Adding to 1213123233213 its reverse (3123323213121), we get a palindrome (4336446446334).

The spelling of 1213123233213 in words is "one trillion, two hundred thirteen billion, one hundred twenty-three million, two hundred thirty-three thousand, two hundred thirteen".