11212211212213 has 4 divisors (see below), whose sum is σ = 12231503140608. Its totient is φ = 10192919283820.

The previous prime is 11212211212199. The next prime is 11212211212217. The reversal of 11212211212213 is 31221211221211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11212211212213 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 (11212211212217) 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, 509645964181 + ... + 509645964202.

It is an arithmetic number, because the mean of its divisors is an integer number (3057875785152).

Almost surely, 2^{11212211212213} is an apocalyptic number.

It is an amenable number.

11212211212213 is a deficient number, since it is larger than the sum of its proper divisors (1019291928395).

11212211212213 is a wasteful number, since it uses less digits than its factorization.

11212211212213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019291928394.

The product of its digits is 192, while the sum is 22.

Adding to 11212211212213 its reverse (31221211221211), we get a palindrome (42433422433424).

The spelling of 11212211212213 in words is "eleven trillion, two hundred twelve billion, two hundred eleven million, two hundred twelve thousand, two hundred thirteen".