1231211112213 has 16 divisors (see below), whose sum is σ = 1649926336256. Its totient is φ = 816662105280.

The previous prime is 1231211112193. The next prime is 1231211112233. The reversal of 1231211112213 is 3122111121321.

It is an interprime number because it is at equal distance from previous prime (1231211112193) and next prime (1231211112233).

It is not a de Polignac number, because 1231211112213 - 2⁸ = 1231211111957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231211112213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231211112233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 835645 + ... + 1777842.

It is an arithmetic number, because the mean of its divisors is an integer number (103120396016).

Almost surely, 2^{1231211112213} is an apocalyptic number.

It is an amenable number.

1231211112213 is a deficient number, since it is larger than the sum of its proper divisors (418715224043).

1231211112213 is a wasteful number, since it uses less digits than its factorization.

1231211112213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2614284.

The product of its digits is 144, while the sum is 21.

Adding to 1231211112213 its reverse (3122111121321), we get a palindrome (4353322233534).

The spelling of 1231211112213 in words is "one trillion, two hundred thirty-one billion, two hundred eleven million, one hundred twelve thousand, two hundred thirteen".