1231212233213 has 8 divisors (see below), whose sum is σ = 1246219638840. Its totient is φ = 1216230906880.

The previous prime is 1231212233189. The next prime is 1231212233257. The reversal of 1231212233213 is 3123322121321.

It can be written as a sum of positive squares in 4 ways, for example, as 36556675204 + 1194655558009 = 191198^2 + 1093003^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231212233213 - 2⁶ = 1231212233149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231212233113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6424820 + ... + 6613677.

It is an arithmetic number, because the mean of its divisors is an integer number (155777454855).

Almost surely, 2^{1231212233213} is an apocalyptic number.

It is an amenable number.

1231212233213 is a deficient number, since it is larger than the sum of its proper divisors (15007405627).

1231212233213 is a wasteful number, since it uses less digits than its factorization.

1231212233213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13039647.

The product of its digits is 2592, while the sum is 26.

Adding to 1231212233213 its reverse (3123322121321), we get a palindrome (4354534354534).

The spelling of 1231212233213 in words is "one trillion, two hundred thirty-one billion, two hundred twelve million, two hundred thirty-three thousand, two hundred thirteen".