11231212213 has 12 divisors (see below), whose sum is σ = 12360990468. Its totient is φ = 10197308160.

The previous prime is 11231212193. The next prime is 11231212217. The reversal of 11231212213 is 31221213211.

It can be written as a sum of positive squares in 6 ways, for example, as 1490114404 + 9741097809 = 38602^2 + 98697^2 .

It is a de Polignac number, because none of the positive numbers 2^k-11231212213 is a prime.

It is a super-2 number, since 2×11231212213² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11231212217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 534420 + ... + 555037.

It is an arithmetic number, because the mean of its divisors is an integer number (1030082539).

Almost surely, 2^11231212213 is an apocalyptic number.

11231212213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

11231212213 is a deficient number, since it is larger than the sum of its proper divisors (1129778255).

11231212213 is a wasteful number, since it uses less digits than its factorization.

11231212213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089544 (or 1089531 counting only the distinct ones).

The product of its digits is 144, while the sum is 19.

Adding to 11231212213 its reverse (31221213211), we get a palindrome (42452425424).

The spelling of 11231212213 in words is "eleven billion, two hundred thirty-one million, two hundred twelve thousand, two hundred thirteen".