1213111213 has 8 divisors (see below), whose sum is σ = 1241069760. Its totient is φ = 1185399360.

The previous prime is 1213111201. The next prime is 1213111217. The reversal of 1213111213 is 3121113121.

It is a happy number.

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 1213111213 - 2²¹ = 1211014061 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 (1213111217) 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, 51708 + ... + 71413.

It is an arithmetic number, because the mean of its divisors is an integer number (155133720).

Almost surely, 2^1213111213 is an apocalyptic number.

It is an amenable number.

1213111213 is a deficient number, since it is larger than the sum of its proper divisors (27958547).

1213111213 is a wasteful number, since it uses less digits than its factorization.

1213111213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123347.

The product of its digits is 36, while the sum is 16.

The square root of 1213111213 is about 34829.7460943947. The cubic root of 1213111213 is about 1066.5147651638.

Adding to 1213111213 its reverse (3121113121), we get a palindrome (4334224334).

The spelling of 1213111213 in words is "one billion, two hundred thirteen million, one hundred eleven thousand, two hundred thirteen".