2121111213 has 16 divisors (see below), whose sum is σ = 3050441856. Its totient is φ = 1303266240.

The previous prime is 2121111193. The next prime is 2121111217. The reversal of 2121111213 is 3121111212.

It is not a de Polignac number, because 2121111213 - 2⁶ = 2121111149 is a prime.

It is a super-2 number, since 2×2121111213² = 8998225555828662738, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2121111192 and 2121111201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121111217) 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, 16798 + ... + 67263.

It is an arithmetic number, because the mean of its divisors is an integer number (190652616).

Almost surely, 2^2121111213 is an apocalyptic number.

It is an amenable number.

2121111213 is a deficient number, since it is larger than the sum of its proper divisors (929330643).

2121111213 is a wasteful number, since it uses less digits than its factorization.

2121111213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84724.

The product of its digits is 24, while the sum is 15.

The square root of 2121111213 is about 46055.5231541234. The cubic root of 2121111213 is about 1284.8560680992.

Adding to 2121111213 its reverse (3121111212), we get a palindrome (5242222425).

Subtracting 2121111213 from its reverse (3121111212), we obtain a palindrome (999999999).

The spelling of 2121111213 in words is "two billion, one hundred twenty-one million, one hundred eleven thousand, two hundred thirteen".