1223111131213 has 4 divisors (see below), whose sum is σ = 1223706900988. Its totient is φ = 1222515361440.

The previous prime is 1223111131181. The next prime is 1223111131279. The reversal of 1223111131213 is 3121311113221.

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 431415139684 + 791695991529 = 656822^2 + 889773^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223111131213 - 2⁵ = 1223111131181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223111131513) 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, 297881808 + ... + 297885913.

It is an arithmetic number, because the mean of its divisors is an integer number (305926725247).

Almost surely, 2^{1223111131213} is an apocalyptic number.

It is an amenable number.

1223111131213 is a deficient number, since it is larger than the sum of its proper divisors (595769775).

1223111131213 is an equidigital number, since it uses as much as digits as its factorization.

1223111131213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595769774.

The product of its digits is 216, while the sum is 22.

Adding to 1223111131213 its reverse (3121311113221), we get a palindrome (4344422244434).

The spelling of 1223111131213 in words is "one trillion, two hundred twenty-three billion, one hundred eleven million, one hundred thirty-one thousand, two hundred thirteen".